Ah yes, the great "Scarlet Witch & Quicksilver aren't actually Mutants anymore so they can't be used in movies made by Fox" retcon of 2015. If I recall correctly (and I'm not going to risk hurting my brain by looking it up, so grain of salt and all) this was about the same time Marvel stopped coming up with new mutant characters, as well ending the Fantastic Four comics run, for narrative reasons that had
nothing to do with the longstanding film rights deal Fox had
And if Lorna is a.k.a. Polaris? I'm cool with this, though that's probably because I haven't seen how she's looked as a character in years (not counting the live action show). As I seem to recall her character design being that of a naked lady who's naughty bits were covered by the green swirlies of her powers (or visually hinting at this), she's likely to get my vote.