User blog comment:Diegoshi/The march to AXIS has ended. Red Onslaught is here./@comment-26118551-20141011030103

I guess that the Red Onslaught is a different being, it's not the same Onslaught who caused the deaths of the Avengers years ago. I think Red Onslaught was created from the Red Skull and Xavier's consciousness only, without Magneto's. When Magneto killed the Red Skull, he destroyed his body, releasing Shmidt and Xavier's fused minds who then took a physical form resembling that of Onslaught.