Without the PF Jean is, just like Maddy, roughly around the same powerlevel as Emma, which is A-Class, but not uber.
But every time Jean had her shining moments of impressive tp feats, it was always about raw power, which included the PF. Emma on the other hand always had her shining moments not because of a cosmic powerboost, but because of her pure own telepathic aptitude.
So without the PF to give her an edge, Jean would go down against Emma ... not that it would be easy for Em, but she would win nonetheless.
__________________
THE CORPS IS MOTHER
THE CORPS IS FATHER
It is wired that Emma is regarded as a close second in Skill. And I think you are underestimating Cable experience. You see out of all the telepaths mentioned, Cable is closer to Xavier age if not older (age is a factor in determining experience). Now the reason why I bring up Cables age, is because he is the only telepath out of all of the ones mentioned, that has had a proper upbringing in the realm of psi at a much younger age.
I mean its bad enough that his personal “will” is well documented, and extremely high (which also plays a factor in TP combat). But since infancy he has bin raised by his parents, and then the Askani Clan to grasp his psi abilities. Members are forgetting that, Cable employed TP to numb the pain of the T.O. and T.K. to halt its cellular progression every day of every second of his life since infancy.
I believe Cable is competing for the experience spot more so then Emma.
True, however that is the only documented combination out of the 75 plus other combination they could muster off. I don’t think its unreasonable to think they mixed it up with more then just Logan and Scott. After all when it was all said and done, the final draft consisted of more X-Men then just those two.
The same Exodus, who got beat by X-Man, who later got beat Cable. In which Cable was even weaker since he was not only hindered by the T.O. but the static released of two parallel characters interacting with one another.
Using X-Man as a gauge, a Cable not hindered by the T.O. holds the same potential. Exudes, Sinister, Xavier, and even Rachael admitted vast inferiority. In X-Man attack, Emma TP abilities where strictly dedicated to just help shield the X-Men’s thoughts.
I mean what hope does Emma have against Cable not hindered by the T.O. ?
None whatsoever! I don't think anyone would argue about that.
But until the most recent post of the tread's starter, it wasn't clear, if we were talking about Cable with or w/o the virus. Now that has changed and it's obvious, that Nathan deserves to be put on top of the list.
__________________
THE CORPS IS MOTHER
THE CORPS IS FATHER
But you see, Exodus was severly weakened, he was reduced to a power leech during that arc. And both Mr. Sinister and Emma Frost have made X-Man look like a chump for all his raw power he never truly focused it until his Shaman days.
She doesn't but then again Cable not hindered by the T.O. wouldn't need to out skill the others he could probably just overpower them individually. He'd go down hard if it was the four vs. him without the T.O though. Cable without the T.O. is kind of like throwing Cassandra Nova into the mix.
Then lets grant all the competitors equal footing. TP on the same level. It would then become a match of will, wits, and experience. Out of the bunch who would come on top?
My personal choice, is still Cable for the reasons mentioned earlier.
Xavier has recently become stronger, I'm not sure how Exodus healing him after he was shot would change that, nor have I seen anything to suggest he is weaker now than he was previously.