User blog comment:Alanomaly/Top 10 Ben 10 Plot Holes/@comment-7503158-20160412091757/@comment-5101200-20160413042540

Because that's not how time works?

If the events that lead up to where you are never happened, you wouldn't be where you are now. Everything from where the timestreams split off with the Omnitrixes was erased, save for No Watch Ben's timestream, so Vilgax never would have gone through the events to get there. In fact, this would result in a paradox as he would never have existed to erase everything, and it would go on in an infinite loop.