Dragon should not give 5 devourer stacks
He's not even purple.
EDIT: This isn't a joke post. I really believe Herald and Baron are the only monsters that should give 5 stacks. They're actually difficult to get, whereas several champions can easily solo Dragon with just the Devourer enchantment. (some even before, but you don't get stacks from that)
Dragon is far too easy to kill, for the reward of 5 devourer stacks and its permanent 5-man buff. I also think skuttle should only give 1 stack, since it gives the ward anyway. The game for the jungler shouldn't become whoever gets the scuttles has more stacks or _need to focus scuttles because the opponent already got sated. _ (of course, this is only in cases where both junglers would buy Dev, and with Xin's buffs coming up this will actually pose a problem)
Harold, since he's nearly impossible to solo alone due to his "weak spot" being the side you can't attack solo, is right to give 5 stacks. Plus he's hard to kill before de-spawn even with your top laner helping. Baron should remain at 5 for obvious, similar reasons.
This would make Sated the Mid-game power spike it's meant to be, instead of the 15-minute spike it's become for champions who already have incredibly fast/easy clear time.
There's my long-winded explanation for why only Purple monsters should give 5 devourer stacks.
**Edit 2: **
Champion kills and assists should give 3 stacks, so that the jungler can't simply solo drag and pretend that was their way of ganking.
Additionally, that would allow a devourer jungler who's behind to get stacks without leaving his team at all, vs. the current method of having to ignore them to focus scuttles while the enemy who's either already sated or doesn't need it does a jungler's actual job.
#TL/DR: Baron, Herald: 5 stacks Dragon: 2 stacks (Already gives a permanent team buff) Scuttle: 1 stack (gives a ward on objectives) Champion kills/assists: 3 stacks (so that a Devourer jungler who's behind on stacks doesn't have to neglect his team to get them)
Please note that this wouldn't make it any more difficult for the champs with extremely strong clear and sustain to do their jobs. It'd just give them more incentive to walk out of the jungle.