Board Thread:Lore Discussion/@comment-72.159.151.72-20150310160704/@comment-25035274-20170111040952

70.120.254.95 wrote: The Dragonborn never did absorb Alduin soul. you can even talk to the Greybeards about it.

No one said anything about the Dragonborn absorbing Alduin's soul. AltmerAussie's theorycrafting that maaaaaybe Akatosh absorbed Alduin's soul.

There's really no evidence for that, though, except the fact that the Dragonborn didn't. And that could simply mean, as is mentioned in the game, that Alduin isn't gone forever.