When Sam died at the claws of Sauron in 1992's X-Force, he came back to life and Cable explained that it was because Cannonball was an immortal External High Lord. (This was just after Sam flatlined from being disemboweled.) The plot was dropped for various reasons until in a recent issue of Cable, the claim was disproved by Cable himself as a rumor - nothing more.

If that is true, was it ever explained how Sam survived this traumatic death experience?