Trinimac is more powerful than Vivec yet Boethiah eat him like he was nothing.
Boethiah doesn't prefer open combat, unless we are talking about Oblivion Boethiah. See? They seem to change frequently. We don't know the circumstances of how Boethiah defeated Trinimac
You also forget that Talos is an aedra and lore STATES that Daedric Princes are stronger than Aedra since Daedric Princes didn't give up their power to make the world.
Lorkhan is an Aedra. Talos is a man whom became a god. Big difference. And how then did the mere projection of Akatosh's spirit defeat Mehrunes Dagon?
Daedra aren't included in the list since they ARE more powerful than anyone on that list so the list would become a daedric prince strength list.
Again, how then did a mere projection of Akatosh's spirit manage to beat Mehrunes Dagon in all of his destructive glory? And what makes you think Michael Kirkbride would say "Oh Daedra don't count, they are OP". Nocturnal got something stolen from her, TWICE! Molag Bal can't punish an old man who's captured by the forsworn without a champion.
Edit: Actually, Nocturnal has been stolen from 3 times. 2 times the Skeleton Key, once her Cowl. Nocturnal, the patron of thieves, getting stolen from. Sounds powerful to me all right