General Discussion

I see a big difference between the likelihood of occupying the exact same spot at 2 times & a cosmological prohibition of doing so.
We agree on the extremely low probability, especially given our inability to traverse interstellar distances.
But, there is nothing in astrophysics that say we cannot do it if we had a ST style warp drive.
The theory does, in fact, prohibit the opposite, because it would require the creation of mass (which hasn't happened since shortly after the Big Band), with the same quantum properties. The former is not possible; the latter stupendous improbable. (Heisenberg and all that)
So, we're on the same page that it would be extraordinarily difficult to occupy the same space at more than one time, but there is nothing in the theory that absolutely prevents it.
I'm not a cosmologist, but I've been an avid student/obersver of that field and the math is not terribly different than that used in quantum chemistry, which I do know.
On board?