User blog comment:Deathfire2001/Welp Theory and Prediction Time (Spoilers)/@comment-45189517-20200613033903/@comment-39963163-20200613141633

But this man is omniscient. He probably would know what would happen if he erased him, why not just kill him?

As for alternate world, if we went from Volume 3 onwards, I think it might be easy to assume that the koopalings have already died. I think they survived because Death Mantis erased someone else from their world, who wasn't erased from the main one. That one I believe would be Bowser Jr.

And there's also proof that it could, as if we look back in volume 4 it was said that Bowser Jr went with the Koopalings, yet if we look at the alternate timeline with the Koopalings, there is no mention of Bowser Jr.