One other thing on the theory of him being from our universe and is a fan. He has technology that is more advanced than any in Ben 10. There could of been a power to travel IN the cartoon.
Don't know how you can explain the fact that he knows the universe was recreated by Alien X. No one, but Ben and the other personalities of Alien X know this. He must be from a "fan universe" and traveled universes. He is supposed to be a combo of Marvel's Galactus and The Collector. The Collector is an Elder who is one of the oldest beings in the universe. He has precognitive ablilities that could see the furture so if Collectimus is based on him then Collectimus could of foresaw the universe being recreated and being an immortal and one of the oldest beings in the universe he could of been immune to Alien X's powers.