Exodus
Mr. Sinister
Jean Grey (no phoenix)
Emma Frost
Rachel Grey (no phoenix)
Shadow King
Stepford Cuckoos (5-in-1)
Charles Xavier (no cerebro)
Base Cable (he has his techno-organic virus)
Pre-Shaman Nate Grey (he doesn't have the shaman tattoo or lifeseed)
Cassandra Nova
Someone not listed
Jean is the most powerful, without a doubt. But Emma is more inventive and ruthless and can probably best Jean in a fight.
Jean Grey currently
Exodus - bottom
Sinister - bottom
Jean - top
Emma - top
Rachel - top
Shadow King - top
Cuckoos - 3 tops, 2 bottoms
Xavier - bottom
Cable - top
Nate - verse
Cassandra - top
Betsy - verse top
Monet - top
Quentin - bottom that thinks he's a top
Oh, you meant power levels? ... IDK whoever the writers want I reckon.
The strongest telepath is Jean. The most experienced is Xavier.
Jeen used her psychic absorption powers to take psychic energy from everyone on a planet, including Galactus and Phoenix/Jean to take down Galactus.
Not that takes away from Rachel’s own powerful feats. There are just differences in how they use their powers. Rachel is more like the Guardisj of the time stream while Jean is more like the guardian of space.
This isn’t the 80s where someone had the title of the most powerful telepath anymore. The fact is telepathy and telekinesis are standard powers among immortal mutants, omega mutants, Eternals, gods, and sorcerers. Marvel no longer gives out the most powerful telepath title.
Someone called?
Jean Grey in the words of Walt Whitman, from his masterpiece Leaves of Grass, "Song of Myself" (51 and 52):
"Do I contradict myself? Very well then I contradict myself, (I am large, I contain multitudes.)"
"Failing to fetch me at first keep encouraged, Missing me one place search another, I stop somewhere waiting for you."
Rachel got owned by Martha Johannson. Where does Cerabella fall on the list?