“It is not necessary to ask whether soul and body are one, just as it is not necessary to ask whether the wax and its shape are one, nor generally whether the matter of each thing and that of which it is the matter are one. For even if one and being are spoken of in several ways, what is properly so spoken of is the actuality” -Aristotle
In order for universes to exist, there will have to be the type of laws which allow universes to exist. That is, it is impossible to have a universe, and not have our laws ,or to have our laws and not have universes. The universe and its laws are the same entity, wax and form. Speaking of external causal factors becomes a moot point within a perfectly self continent, eternal whole.
There is no need to posit a First Cause.
There is no need to posit probability.
There is no need to posit tuning.
We have no real need to ask why our universe exists with the traits it does. It couldn’t be any other way.