Your point is really REALLY weak because where as Kirby's idea of taking power from enemies is a more literal, very defined and linear idea, Mario literally becomes what he wants. Your point about how this is just an evolution of the Kirby formula doesn't make much sense, not only because it's just a wild leap in logic, but Kirby's whole schtick is that he eats enemies and looks cute doing it. Mario's idea is non linear. Plus if Kirby became an enemy there would be no trademark to recognize him as Kirby.
This is just so far fetched especially because taking enemies power has been in many games since the NES, whereas becoming an enemy is relatively unexplored







