I've been away. I have only two comments.
First: The application of the Heisenberg's uncertainty principle to the question of what can or cannot be known is absurd. As if the "position" and "momentum," if any actual particle could actually be identified, and either its position or momentum measured? The entirety of the uncertaintly principle is not an indication of what cannot be known, but an observation about the statistical nature of what can be known, and a failure of the statistical method to resolve certain aspects of sub-atomic behavior. (The fact that another method might produce different results seems beyond the imagination of the current crop of so-called scientists.)
Second: What cannot be known does not matter. There can be no importance or significance in what cannot be known. Only what can be known matters. If something cannot be known at all, in any way whatsoever, it is exactly the same as being non-existent. In fact, it is non-existent. It is a fiction.
By the way, there are not multiple universes, or existences, or realities, either, anymore than there are multiple personalities. Belief in either are similar pathologies.
Hank