Thread:ADour/@comment-24991799-20170424165632/@comment-4651179-20170424213125

I think just being in cahoots with Magneto, without being an "official" member of his team, is reason enough for Kurt to ask if he can rejoin Storm's team, specially considering helped a faction thaboth factions were at odds.

However, I don't remember many specific details of the series, so I won't deny the lingerings of my interpretation could be the only reason I don't think Kurt was part of Magneto's team.