Well if you're going to just change the rules more and more eventually GV is just gonna have no chance of winning, so like, KO can still be a specific win condition. At the same time, GV also has more Stamina and pretty much everything over Rayman, tbh, it's kinda a mismatch based on the rules- we either allow KO and GV Stomps, or we only allow an actual deceased body as the condition and Rayman wins, even tho GV has Stamina.
GV also has Anthem Regen too, but again, ban, same with Prevasion- he could theoretically negate Mid G. Regen since he beat Copen too, but that's a "possibly"