Concerns about Cho'Gath
I like the idea of making him a stacking champion(even if i hate them) but one issue i have is that he still has an AOE silence despite being able to get 6000 health building full damage. Juggernauts should not have 6000 health, CC and a silence, he already has a true damage execute that gives him permanent health. He probably doesn't need an AOE silence and CC anymore if this is the case because he'd just become broken.
https://www.youtube.com/watch?v=40cykyYI3sQ
In addition he can stack it off of minions, which also halves it's cooldown, refunds mana, deals a guaranteed 1000 base damage and heals him.
Edit: As an after thought, the way this could be mediated is by setting up a system where cho'gath gains health proportional to the size of the enemy he ate and whether it was a champion or not. This way if he stacks off of minions he won't have as much health as if he had stacked off of champions.