I think Wulfharth goes above and beyond being Dragonborn. He is Shor's ghost, afterall. And Shor demonstrates his shouting ability in Shor, son of Shor on a few different occassions. Maybe that's why.
Gods damn you, now I have no idea again. Maybe he is dragonborn but he learned the shout because of what you said.
I dunno. Kind of seems fitting to brand the guy Dragon of the North for reinstating the traditional Nordic pantheon, though I get what you are saying.
Also may have been confused in the Talos business.
Edit: Ninja'd.
Wulfharth was named Ysmir by the Nordic people.
So Alessia created Akatosh, yes?
The Marukhati had nothing to do with his creation, just tried separating him from the elf god?
Even if the Marukhati's didn't succeed, would mythopoeia not work anyways? Clearly many think or did think that Akatosh existed separately from Auriel and from the beginning of time. Plus the whole Dragonborn thing and the whole Empire thing and the whole saving the world thing.. he seems to like this Kalpa over the others. Why? Because he had Shezzar mixed in with him. Doesn't explain why Miraak was dragonborn besides a giant clusterfudge of dragonbreak. Aka-Tusk is... something? We don't know anything about that besides obscure text and even then.. wtf is it? Is it the thing on the word walls? Is it why Kohnarik is tusked?
Akatosh is one aspect of lore I think the devs get a little bit too convoluted, to be honest.
As for "who let the Dovahkiin's out?"..
Arngeir says "some say they are sent by the gods in times of great need"
MK says "the eight (and one) limbs have always made a loophole"
Tsun says of Shor "perhaps, deep counselled, your doom he foresaw"
Seems to me at least, that this is not just the doing of Akatosh.
Yeah, Alduin is another enigma of sorts because of his similarity to Akatosh, direct opposition to Akatosh and claimed sonship of Akatosh. He's very similar to Satakal in Yokudan myth.. so his sphere seems not to just have been something in Nord legend..? So many things are connected to Akatosh that the Shezzar-grafting process makes time wholly convoluted.
Ten Reasons the Main Character is a Shezzarine