You can eventually link everything back to Amaurot by virtue of it being a world government over 12000 years ago, but not everything has to be a direct consequence of it.

I think one of the weaknesses of the writing around the Garlemald and Allag storylines was the revelation that they were both directly micromanaged by the Ascians. They're just subsidiaries. Why would you waste your time with them when you've already taken out their overlord?

That doesn't necessarily need to be the case going forward. For example, it's theoretically possible that the rise and fall of the Ronkan empire was directly manipulated by the Ascians. But they have much more potential if they were just out doing their own thing, because you can actually build them into a unique lore entity. Tural has much the same potential. You need to build in parallel rather than in series. Otherwise you end up with a bunch of serial puppetmasters all tied back to a villain whom we wiped the floor with ages ago in 5.0.