But the guy in the prequels is Vader? Lol.
No: he’s Anakin Skywalker. He only becomes Vader after the “Nooooo” (so Vader appears only in two shots, at the very end).
So when he’s in the suit talking about Padme, he’s not Vader. And when he walks like Frankenstein and shouts “Nooooooooo” he’s not Vader.
I agree!
Seriously though, you’re playing a game of semantics. Lucas tried to have Vader in the entire PT via Anakin…that was his whole reason for doing the PT. And Lucas fails miserably because Anakin/Vader fails miserably. The costume (and when he is or isn’t wearing it) is the least important part.