As for C'Thun, Lu Li recalled that C'Thun didn't take as long as Ouro to defeat in his previous life. There was a team who killed C'Thun around two weeks after defeating Ouro.
This didn't mean that C'Thun, the first Old God to appear in Dawn, couldn't even compare to its own pet, but that the company had massively nerfed it.
Otherwise, this Instance Dungeon would take forever to complete.
The cooldown reset the day after they killed Ouro, so everything was revived, including the recently-killed Ouro.
If Ruling Sword hadn't 'secretly' killed Ouro, then Sorrowless would have led the Super Team to kill him today. However, Ruling Sword threw a wrench in their plans, so all of them had to disperse and deal with Ouro themselves.
The Stronghold battles hadn't yet begun, so everyone needed to capitalise on the time that they had while in possession of a Stronghold.
