User blog comment:4. 1. 22. 5. M97/Blog Critic: "Why the Empire should prevail over the Stormcloaks" refuted (part1)/@comment-9062114-20140103232600/@comment-25109952-20140105115715

Maybe Ulfric is actually an elf wearing his skin. Think about it:

When he was captured and tortured, a Thalmor agent skinned him, wore his skin and then became Jarl of Windhelm while faking a brilliant accent/voice.

It's probably not true, though.