Thread:Gijimu/@comment-3406131-20141002154344/@comment-3406131-20141002162506

No, you haven't got my point:
 * On mainstream universe (Earth-616), all the characters here are mutants: X-Men, Xorn and Shen Xorn, who are part of the X-Men at some points.
 * But on Ultimate Universe (Earth-1610), while the X-Men are mutants (from another origin), Xorn and Zorn are not mutants but Source-powered humans, who weren't part of the X-Men.

And here, it's Xorn and Zorn (ultimate names), with their Ultimates looks, but part of the X-Men. I don't know if the other X-Men have more Ultimate or Mainstreams looks (not an expert on those kind of things), so they might be mutants or Source-powered, with currently more clue for this last option.

We can reasonably think the other X-Men are mutants as it is mostly the case in other realities. We're sure for Xavier, stated to be by Terrax. But for the Xorn/Zorn, we can't be sure, as they aren't often witnessed in Multiverse to pose a generality on them.

If I had to vote, I would say they match their Ultimate counterparts, but there isn't enough clues except the names and looks for them. Also, who knows if the SEAR or the Source exist on that world...