How are the ancestors post scratch versions of the pre scratch trolls if they (ancestors) are older?? Isnt pre before and post is after-newest versions?? Like Ancestors made their history. How is that possible if they're post scratch? Did they scratch backwards or something? (Sorry if that doesn't make sense)

What you need my friend is a refresher on Simultaneity and the Scratch Mechanics. The Scratch is a hard reset- What comes ‘after’ isn’t a continuation, and what happened ‘before’ isn’t what happened chronologically before. If there’s a Scratch, the Universe accounts for it already. In the eyes of the Universe, there has always been a Scratch, and both Post and Pre Scratch versions of the Universe exist simultaneously, and disconnected from one another. The Timelines have no point of interjection between the different versions of the Universe. They just are two separate instances.