I'm too tired to go into detail about this, so I'll supply the basics.

Jurgen Windcaller ate the shouts of every Tongue he faced after his self exile after losing the war with the Dunmer/Dwemer. Allegedly he communed with the goddess of war - Kyne - who told him peace was the way, and that was how he ate the shouts.

I'd long held that Jurgen was dragonborn, because when you return his horn to his grave you get a dragonsoul. My new theory doesn't alienate this, but what if... Jurgen actually spoke to Mephala?

I personally i doubt it mainly because making someone more peacfull is hardly a mephala thing.

Also something complitly diffrent but is it just me or is X was Mephala starts to slowly become a lore forum meme alongside "X,Z,and Y is enatiomorph" and " is this even canon?"

No it's not just you, sadly it's becoming a thing

No, Jurgen either talked to Kyne or Paarthunax or both.

I don't believe that Jurgen spoke with Kyne at all. Paarthurnax is neat, but it doesn't explain the Daedric tomb, nor how he ate the shouts.