You know that M80 had a mid-season roster crisis where they lost their IGL right? (kinda an important role)
That probably explains his 'falloff' where he's still one of the best players in challengers.
And last year he was by far the best t2 player for the entire year
1st place main league - https://www.vlr.gg/event/stats/1458/challengers-league-north-america
2nd place ascension tourney - https://www.vlr.gg/event/stats/1653/champions-tour-2023-americas-ascension?exclude=&min_rounds=0&agent=all
You know was there with him? Tex, EEIU, Valyn, Verno, N4rrate, Oxy, JonahP, Trent, Moose, Governor, Mada. Nismo was better than all of them last year. And this year when he's in a 'slump' (which there's a very good reason for, as explained earlier), he has a 1.10 rating.
Asuna has had a good year, if this continue's there's no case for replacing him, but lets not act like prior to this season he wasn't the posterchild of inconsistency.