Well, this is kind of why polytheism is fun, no need to choose. Having to pick one individual one to rule everything just seems kind of like a bad idea anyways, the world is too diverse for one "ruler" in that sense.
It's a god. You can just define it as being capable of handling that much diversity.
I think you can, but I don't like the concept especially, it doesn't feel fitting for how things are. *shrugs* But it's all a matter of perception really.