The Human Question

What if at each level, form is contingent AND prime matter is not some pure underlying stuff, but rather the potency of any substance to become any other kind of substance? In such a case, wouldn't the third way avoid the fallacy of composition?  For one could apply it in a kind of orderly way to each m/f relation within any particular substance and arrive at a conclusion about the whole, doing so in a manner analogous to how the first way, rightly considered, has to do with per se movers, and the second way has to do with per se causes rather than per accidens...

... to acknowledging that our universe is contingent? Matter doesn't have to be this way: in fact, the matter called "our universe" doesn't have to be at all... (see Aquinas's 3rd way for more). And don't the various hypothetical universes have to be individuated in some way? (I dunno, but it seems so). That is, don't they have to have something different about them: otherwise, there would be no explanatory gain in positing them.