Also, is this a choice? Towards the end of pt. 1, it says "Enter the keep with either Hadvar or Ralof." Is this a stormcloak/battle born alignment decision?
Wow, and another choice to apparently escape with the Imperials? Bethesda lives up to their hype!
I think if you choose to follow Ralof, you'll escape with the Stormcloaks. Hadvar was the Nord loyalist reading names at the execution, so I guess thats the option to escape via the Imperials.
I've got no idea where Ulric went after he followed Ralof, but I'm guessing he escaped with the others since he's in the other video on a throne.