I see what your going for... but the fact of the matter is Base Goku is an entirely different level of power from any one of his transformations. If someone beats him in base, it's not all to impressive as he's got more levels of power in reserve. If some beats him out of, let's say Super Saiyan Blue... Base Goku is F'd because he can't contend at that level.
That's what Nickt is trying to express here. Greninja, as a whole, is powerful sure, but it's only his Ash-Greninja form that reaches that level of power. If Greninja is losing, he can transform... if Ash-Greninja is losing, welp that's it for him.
Base Greninja isn't at the level Ash-Greninja is
Based on feats, Base Greninja isn't on the level Talonflame is either (And this is actually a proven fact by comparing both feats as well lol). Still people try to argue against facts is whats funny to me.