Darius + Righteous Glory?

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Actually i'd say Black Cleaver helps his kiting more. TF phage passive only work on AA, meaning Darius have to be already caught up to someone in melee range to aa and get the ms boost, while Cleaver Phage passive works on Physical damage meaning when chasing he can q (no cast time, no interrupt) a minion and get instant speed boost, even more if you kill a minion along the way. The zeal as is not that much, and the 20 cdr is actually very very good on Darius. With cdr he can actually applies BC cleave very quickly with the combination of Hydra and Q spam. Darius power budget lies in his Q and Ult, which until lvl 16, cdr helps a metric ton in outputting aoe damage and having his most important spell up as fast as possible, not to mention hes most vulnerable with E down, which have a huge cd. Darius is an AD caster tanky bruiser, and CLeaver gives him everything he wants.

And the health is not "whatever" its 400. A good amount actually. Pairing Cleaver with FH and you have a really tanky Darius with 40 cdr thats shreding everything in sight with out fear of mana and becomes really hard to kite or kill

Black Cleaver does help with kiting more, but only slightly. TF only works with AA if you don't kill the target. If you kill the target with a Q you still get the 60 movement speed boost. Your scenario also only applies to chasing in lane, when chasing in the jungle or even just in a lane with no nearby minions, you would have to Q a champion you're chasing for the boost. And if you can do that, why not just hook them? And in lane, sure, in some scenarios Q'ing to chase could be beneficial, but I can't think of a time I couldn't just auto a nearby minion to run up and hook that annoying Teemo who thought he could farm while in my lane.

The zeal will be a big deal when applied to the movement speed you have hopefully built (alacrity boots, fuck yeah).

The twenty CDR is good on Darius, but is it good enough to replace a hydra or a triforce? No, not at all. The way you're describing Darius in a team fight makes it sound like you think his place is in the front lines, as if he were a tank. He's not a tank though. Darius' real place in a team fight is chilling with the ADC to peel, because his hook and W (which hurts like fuck with a triforce) are excellent peeling tools.

Cleaver's not bad on Darius. It's pretty good. It's just not as good as a Trinity Force or a Ravenous Hydra.

It is indeed a good amount, but health can be gotten elsewhere. What triforce brings can not.