didnt mehrunes dagon get defeated by a divine? also alduin is a divine and when you wear deadric armour fighting him he`ll say even the daedra fear him.
Corect. Akatosh appeared as a dragon, defeated him and made it impossible for him to physically manifest himself on the plain of Mundus ever again.
The Daedra are not stronger what so ever, in fact, they're quite weak. That is why they rely so heavily on intervening in mortal life.
The Aedra, however, do not. They don't need to consolidate their power through petty deeds or physically manifestation. They're all powerful and they keep the balance consistent on the plains of Aetherius, Mundus and Oblivion. Without them, those plains would fall apart.

