Board Thread:General Discussion/@comment-11276487-20130724230617/@comment-10056803-20130726222417

Mephala was a nightstand used to barricade a door in midair. Sanguine is using a representative (who, as Pink Slim stated, is not supposed to be fighting in Morvunskar). Nocturnal was only metaphorically there for the restoration of the Ebonmere.

In general, the avatars of the Princes are actually not supposed to be superpowerful (with the exception of the time during the Oblivion Crisis where Mehrunes Dagon tried to invade in his 'true and terrible form', presumably by putting absolutely everything the Deadlands had into trying to beat his way into Nirn only to be smashed back by Martin and Akatosh, and there's a reason it was called the oblivion CRISIS.), especially if you use console commands to drag Sanguine into being your follower (He currently wields a daedric bow of annihilating with daedric arrows. Because lulz) and such uses of console commands.

And limiting Alduin was a likely thing. For example, he doesn't attempt to eat you whole in Sovngarde, and he doesn't nom the souls of any bystanders either, though that might be because you disabled his soul snare fog. Also, Alduin is at least somewhat limited to the form of a dragon on Nirn, at least until it's his job to eat the world and it's the appointed time (Alduin seems a bit underwhelming in size for planet-nomming if you ask me).