Leeroy Jenkins
Footballguy
Assuming the books bring Jon back differently I would say through Bran as he seems to have communicated with Jon from a distance before, no?Not sure if there is a specific prophecy that points to Jon Snow, but i think it is inferred IF, his parent's identities are revealed to be Rhaegar and Lyanna. It was believed that Rhaegar was the Prince that was Promised.
Also, regarding Jon's parents, if we (readers and watchers) end up finding out that R+L=J through Bran, how does Jon find out or even the rest of Westeros?