Interesting Thread, My 2 cents worth on:

We've observed quantum particles occupying the same space at once...

Personal perceptions of what is reality given/accepted but the general principle is that we cannot measure both position and time simultanously on the quantum scale. (it's "either or" but not both.) The quantum argument is the opposite of General Relativity and what starts to happen at the very "large end of scale", where given enough scale there is no space or time only space-time. At the quatum level space needs to be redefined as "something else" (call it x), then at x we can have simultanous particals, and/or particals that pop into and out of existance and entanglement etc.