Incitemaybe said:
So besides the Original, is Super Metroid the only installment to claim "Cuz" as the reason for the loss of abilities?
Metroid II, Super Metroid, and, if you want to get really picky,
every single game in the series.
Not one of the games starts you off with what Samus had at the end of the previous game.
Personally I think it's entirely unimportant.
Gaining abilities and going from extremely weak to god-like by the end of the game
is the quintessential Metroid gameplay.
I'd rather they not even bring it up than have some ham-fisted explanation shoehorned into the first 5 minutes.
Fusion is the
only time the loss of her abilities is relatively organically integrated with the narrative.