Rhade able to kill an earlier version of himself and still exist?

If the Rhade that kills his earlier self is from an alternate universe. So Trance sends him back in time and do "our" universe to fix the future? What about their universe?

That paradox only works with the single timeline theory. With multiple parallel timelines, the moment they interacted (Young Rhade turns to look and sees Old Rhade) created a new timeline. From then on, anything they did would not affect Old Rhade's past. Izkata 18:35, September 30, 2010 (UTC)