Board Thread:Lore Discussion/@comment-6702118-20140722142914/@comment-9062114-20140722155325

Alduin, is likley more powerful than any of the Daedra. As he starts and ends each of the Kalpas, which have the power to "switch" the Aedra and Daedra (example: Hermeaus Mora might've been Stendarr in the last Kalpa), so Alduin can technically control them, in a way.