Board Thread:Questions and Answers/@comment-26529096-20150624194414/@comment-4651179-20150717224120

Zarmaug: He re-created them with his omnipotent powers. However, he was only able to recreate the collision points of the destroyed universes (there's more on what caused the collisions here. That's why there are only a small portions of universes, and not all of it.

Thor2000: This event wasn't created to end the Ultimate Universe. The idea of Secret Wars was conceived by Jonathan Hickman even before 2012. All of his work since 2012 (namely Avengers and New Avengers) was a build-up for this event.