Assistant coaches still put in a lot of work with strat-making and anti-stratting. Idk what the C9 coaches roles were, but a coach leaving, assistant or not, definitely leaves a gap in the team.
Curry's utility and teamplay is dogshit, he was mad about people pointing out his statline so he baited for kills which lost them the game. If Xeta was still on the team I think they're still in it tbh