Board Thread:Lore Discussion/@comment-6702118-20140722142914/@comment-174.44.92.186-20140819013740

Doubt it. You couldn't do anything to Dagon in Oblivion and you could beat Alduin quite easily in Skyrim. The Aspect of Akatosh beat Dagon because Dagon had to use much of his power to power up the portals so he could get through Nirn and Daedric Princes are much weaker on Nirn. And Martin didn't "destroy" Dagon (Daedric Princes can't die). He simply banished him back to Oblivion. So I don't believe current Alduin would beat Dagon. Certainly not on his home turf, at least.