Board Thread:General Discussion/@comment-32773930-20170827054513/@comment-26074798-20170827060527

The problem with your theory is that there's no way of knowing. Both Miraak and the Last Dragonborn is that they both become/were immortal under the power of Hermaeus Mora. The Last Dragonborn becomes H. Mora's slave once the Dragonborn questline is over, and as a result even if we played until the 6th Era we'd never know.

By the same degree, you could also propose that the Fallout Universe is the same as the Elder Scrolls universe, which actually has more solid evidence than your theory.