But since there are laddies around here who say that the deterministic universe is contingent but the universe as a whole might not be what are they talking about, apart from emergence?
I have absolutely no idea what possible depth of convoluted misunderstanding has led you to even suggest emergence. As and example (that I've already been through), the structure of the space-manifold means that causation happens within it, along timelike directions. The manifold itself does not an cannot change because it
contains time. The manifold and its contents aren't emergent, they are the basics of what exists (as far as we can tell from current science).
Since you haven't defined how anything can be its own explanation, we can only guess if the manifold and its contents might be necessary even though its contents aren't, in much the same way as its contents are subject to time and causation but the manifold itself isn't.
Emergence has nothing to do with it.
It's been done.
Where? Exactly how is it possible for something to be its own explanation?
It's contingency only that is suspect mate.
Is it, why? Regardless, I don't think anybody is arguing for contingency only. As I keep saying:
I don't know. What's more I
can't possibly know until you properly define the concepts.
You still don't seem to grasp that it's
you who are trying to make a case for something.