Board Thread:Questions and Answers/@comment-16461120-20160408123829/@comment-61022-20160415161751

I would suspect that Marvel isn't going to revisit these realities anytime soon, if ever again, they all seemed more like one-offs (like What If? universes for the most part)

That said, the notes section of each of these profiles should say something to the effect of:

"The universe designation for this character cannot be definitively be determined at this time. As such they have been given a designation to the reality they are most closely associated with until more information becomes available."