Is there one more major faction still be introduced?

after spending a good deal of time think that the all-star is the big bad of the schlockverse, last week's conversations definitely changed my mind. Hunting through a lot of comics for various quotes on things allowed some details to get refreshed and sorted.

So I am curious we people come down on the question

Is there another faction still to be introduced?

minor evidence for:

twice now we have had the schuul directly (mallcop) hinted at (end of book 15) being involved in circumstances that the toughs have gotten themselves and urtheep industries were connected to the book 15's events as well.

Do we have any other major points over the whole series were we don't know who or what happened in any detail?

is there a group that likes to cause the major extinctions that the all-star avoids?

who cause the dark matter creature to escape the world forge?

what's others thoughts here?