Legion would have a very good chance if he could keep his 3 separate identities (and there three specific powers) together. However he is only able to use one identity at a time, meaning that he can only use telepathy, or telekinesis, or pyrokinesis .....but never all three at the same time. And this is why Nate would beat him.
If Legion could keep his personalities as one he would be equal to Nate. Maybe even arguably stronger. But Legion was never able to have all his identities really work as one.
Gender: Unspecified Location: Speedblitzing around the universe f
I don't think you can - Merged Legion only appeared in one storyline. So his feats are limited to what happened in those few issues. Everything would be speculation. But he was pretty impessive.
so what makes u think thatxavier can stand upto nate then seeing as nate had greater power than cable{or atleast his equal if a cable fan wants to argue the point}
Gender: Male Location: somewhere looking for trouble
Xavier is experienced..xman might get cocky and think...." I can beat this old crippled dude no sweat...and BAMM! Xavier does something to him...Cable..at regular strenght beat Xman before...so why no good old proffessor X?