It's been a bit since I watched Charlotte, but if I remember correctly, in the first episode, when Yu is given the fake test by the student body of Hoshinoumi Academy, he attempts to cheat as a last resort, possessing Jojiro to attempt to get the answers. Needless to say, this doesn't end up working. It is later revealed that Yu's ability is actually to steal abilities, "Loot."
Doesn't this mean that he would have stolen Jojiro's teleportation ability? Is this just a plothole or is there some reason that Jojiro keeps his powers?