Gohan cannot win without a full power Kamehameha. He certainly is not beating SPC in a hand to hand battle. Is that what you are arguing?
Gohan's statement is contradicted. Otherwise he'd never been able to beat Cell.
Gohan was capable of launching a competitive Kamehameha immediately. Also, he may have tremendously superior ki amp and ki attack abilities compared to Part 1 Roshi.
What I'm saying is that Gohan defeats SPC without launching a KKH at 100% because he couldn't do it since he didn't have 100% of his energy. And I've already proven that he himself (who should know how ki works) thinks this, and he's not contradicted by Goku regarding how ki works, but rather about the fact that he can actually achieve it if he tries (Goku's not going to tell him not to try and just die).
Your counterargument about Gohan declaring that you can’t launch a ki attack when you’re exhausted is that he has no idea how ki works, as if it has ever been shown that Gohan has little knowledge about ki or as if he were dumb. And you argue it with total certainty, it’s ridiculous.
Also, I gave you a clear example where Muten launched a tiny KKH when he ran out of energy, but that example doesn’t count for you, just because.
It doesn’t matter what evidence or arguments I give, all you're looking for is to win the debate no matter what.