I don't understand why we talk about TP the whole powerset of a character must play a role... Nate Grey for example has Reality Warping. But we don't care. We rate him as a Telepath. And as one he is not more powerful as Jean/Emma/Xavier. Why his Reality Warping even taken in consideration?
As TP power goes it is Jean >> Xavier/Shadow King >= Emma and then the others. Emma's skill matches Xaviers'. Jean is quite skillful too.