I know this is probably a bit late to post but as someone who likes the champ how it currently is i want to have some input into it. So sorry for the late post. And sorry for the massive wall of text this is.
Firstly adding supportive abilities into a champion that goes top lane is a bad idea generally. This is worse for aura abilities like the boards are suggesting. This is because they typically cost a large power budget as they allow other champions to be better at what they do. Aura abilities are worse because they increase in power the more allies are near. This means that the champion becomes weaker into 1v1 situations, especially against lane bullies such as riven and pantheon. A example of a champ that suffers for this currently is Shen. His laning phase was nerfed (his dueling power on his q) due to the power of his ultimate which allowed him to support other champions in other areas of the map. This also causes problems when it comes to skill. A ability that buffs allies is going to be stronger when it is fully utilised by the person, as shown in pro play quite often. Furthermore this goes against the 'hidden power' that riot hates in champions which would potentially cause him to get nerfed again due to that.
What you have proposed here is almost completely correct and what should be focused on a aatrox rework.
Now, I'm no Aatrox mains but here are some of my thoughts on Aatrox:
Revive passive
I feel it keeps him back, it takes up a lot of his power budget and I feel it doesn't really fit him that much.
Blood well does have the potential to be a very impressive ability, fighting sustaining Aatrox and giving him the tools to really do his job as a diver.
A Blood shield of sorts or something that helps him IN combat could be cool and would make his fighting pattern a lot cooler.
Besides, he could have decent base stats then!
Massacre
It looks cool, a Demon channeling his inner bloodlust to sustain his battle spirit.
His increased range, AS and floating VFX are awesome but it could have more impact.
It could tie into his lore to inspire his allies, providing a team wide buff of sorts and really being the high point of Aatrox's gameplay.
Diving into the enemy team and starting to massacre them, his allies following suit, invigorated by his might
more refined basic abilities
I feel his abilities, while being cool could benefit from being more impactful and more satisfying to use.
His W is awesome as a concept, rewarding great management
Q can be cooler, maybe even be a two part ability?
E is frankly a bit boring and could be more
Firstly you are completely right in stating this
Revive passive
I feel it keeps him back, it takes up a lot of his power budget and I feel it doesn't really fit him that much.
Blood well does have the potential to be a very impressive ability, fighting sustaining Aatrox and giving him the tools to really do his job as a diver.
A Blood shield of sorts or something that helps him IN combat could be cool and would make his fighting pattern a lot cooler.
Besides, he could have decent base stats then!
His passive revive is the single handed most aspect of his kit that gimps him. It forces him to have weak base stats due to having to re-kill him if he dies. It allows him to have free tower dives etc... which all combine to unbalance the champion. I feel it is also partly the reason that he is feast or famine as he is forced to buy tanky items to compensate for his lack of base stats, but has to trade damage for it, which also affects him because of his bad base stats. So he has to stomp his lane to buy the damage items required to make his kit effective. I actually really like the shield idea that you proposed and it gave me idea. What if filling his bloodwell completely gave him a temporary shield scaling of ad that decayed rapidly. This would be visible to both him and the enemy and would give him a reason to engage in lane and in fights without the risk of him being blown up instantly soon as he jumped in. This would also work with his current ult due to it changing the bloodwell depending on the number of enemy's nearby meaning he would gain a shield soon as he jumped onto the enemy team giving him a chance to survive. The one problem would be how to work out how he would gain attack speed from his passive though because he needs it. Maybe 2 different bars? Needless to say however, his revive needs to go period. It just causes too many problems in his kit and has no counterplay unlike the other champs that revive such as zac and avivia being able to die while they are reviving.
This one is 50/50 however
Massacre
It looks cool, a Demon channeling his inner bloodlust to sustain his battle spirit.
His increased range, AS and floating VFX are awesome but it could have more impact.
This is because while it may not be as strong as most ultimate, it is extremely underrated. This ult allows Aatrox to duel effectively early game and combined with his 3rd w and q allowed a surprising amount of burst at level 6. Could it be better, yes. Should it be better, maybe. Leaving it how it is will allow for more power budget elsewhere in his kit such as his w for example.
I however completely disagree with the second part of this though
It could tie into his lore to inspire his allies, providing a team wide buff of sorts and really being the high point of Aatrox's gameplay.
Diving into the enemy team and starting to massacre them, his allies following suit, invigorated by his might
Auras are bad. This has been confirmed multiple times. It adds hidden power into the champs kit which screams for riot to nerf the champ. For example this plagued taric pre rework and forced him into the trash teir until he was reworked. I honestly hate this idea the MOST out of all the ideas out there for aatrox. PLEASE DO NOT SUPPORT THIS. It MAY be a interesting concept. But it ultimately ends up with the champs being reworked or forced into the gutter, look at old taric and sona for example.
I completely agree with this.
His W is awesome as a concept, rewarding great management
His w is why i love playing aatrox. It just feels so good to hit with the 3rd attack damage w and heal with the healing version of it. This is the one part of the kit i want to see preserved completely. It is so fun to use and makes him unique compared to other champs.
I disagree and agree with this.
Q can be cooler, maybe even be a two part ability?
E is frankly a bit boring and could be more
The q is a good skillshot how it currently is and is rewarding for good play. However the problem with it lies on it being countered by everything that touches it. To solve this i think it would be a good idea to either a make it so he always completes the flight, but if he gets knocked baked or knocked up he gets stunned after he lands. It already does this for stuns so why not other hard cc too?
This E i agree is boring and probably can be changed around a bit but to what i honestly don't know how to change it.
Anyway thank you for creating another thread about this, and though it didn't gain traction like the last one did it still makes me happy that you thought about the players who currently like the champ. I seriously hope they don't rework him to be more supportive. He is a fighter, fighters don't buff their allies, they fight and i fear that changing him into a more supportive role, will hurt his fun lifesteal/damage dealer playstyle that he currently has.
Summary - rework idea is mostly good, the idea to make him more supportive is REALLY BAD due to old taric being reworked because of his supportive damage buffs applying to teammates.
If you want some more reasons why support aatrox is a bad idea, just message me and i will post a argument against it.
Thanks for reading :) sorry for the long post lol.
edit- grammar