Jones has the reach to keep GSP at bay, as well as the takedown defense to null GSP's wrestling ability.

Jones also has awesome takedowns and better jiu jitsu, as well as a much more vicious ground and pound game.

Jones via domination.

Jones would win as he is a light heavy and gsp is a welter

GSP is the better pound for pound

probably BJ penn because he would take the fight 2 vs 1

GSP!!!!!!!