I can respect a man's Claremont canon, but I'm pretty sure Claremont's Kitty would still be like, barely 20. He still writes Rachel as a teen. Anyways, as for Alex, I think he was supposed to be actually over 21 in the issue, as Scott makes an offer to buy him a drink and says he's old enough now.
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Let the flames destroy all but that which is pure and true!
Magneto and Emma Frost, I absolutely doubt. Their X-Men Black issues are meant to reposition them in a new light for the new era. Plus, Emma has plot protection since she's in Infinity Wars. And Bunn's """killed""" Jimmy off and sent him off the cast, but I wonder if that'll stop the ol' Brisson Bloodbath Machine from touching him.
But yeah, Kymera, X-Man, whoever's leftover from X-Treme X-Men, Cecilia Reyes (i just KNOW those kids are gonna blow her up Gifted-style), and Rachel are all top of the list.
Let the flames destroy all but that which is pure and true!