I wonder what sort of significance Allison has/had to john in the future. Cameron said that both the machines and john had picked her...and the fact that cameron later goes on to infiltrate the camp and john reprograms her instead of destroying her seems to imply him and allison had a romantic relationship.

It makes you wonder though, if that is the case, did john like allison because as a kid he had met cameron who was created in the future and based on an adolecent allison? its a fucked up paradox.