Board Thread:Ben 10 Discussion/@comment-4969948-20160930222056/@comment-24922135-20161007171225

I think that was just Paradox's way of making sure the timelines went ahead as they should (implying if he hadn't interfered, Ben would never get the omnitrix), whilst also training No Watch Ben with the omnitrix. Going to the other timelines was just a recruitment exercise. Remember, even in Paradox (the AF episode) Professor Paradox states that he alters history to save lives.

If you don't like my explanation, that's fine. I understand why you wouldn't. And at the end of the day, this is just speculation. But I have thought for a while about how this episode works, and this is what I came up with.