Considering the X-Men have encountered Beyonder, Celestials, Thanos, various reality manipulators and many more powerful beings, I am not so sure they hold Phoenix up as the ultimate power or anywhere close.
Medusa :
A married queen of the Inhuman race, that's a redhead than can choke him faster than he can say "Jean", totally cyclops type. On the other hand Emma danger factor has lowered through the years