I think those all kind of made sense, since Angel and Plague survived the Morlock Massacre which proved them "fit", Autumn overcame her parents' domineering ways, and Abraham survived the Vietnam War. They all overcame something. None of the mutants who died on Genosha really did, besides Gambit.
Either way, I hope we see Plague, Autumn, and Abraham return alongside Gambit as War. I doubt it'll happen, but they're still likely under Apocalypse's influence in '97. Even the Horsemen he used in Beyond Good and Evil were basically versions of Plague, Autumn, and Abraham design-wise.