What happens if I do the civil war quest line before I slay Alduin? I finished the Alduin quest my first play but was wondering if I can do the civil war line first. Say I side with the Stormcloaks this time, didn't last time. What happens in Whiterun when I need to trap the dragon to get to Sovergard. The original Jarl is gone so does his replacement allow that to happen, any bugs or busted quests if done this way?

You'll need to do a speech check, but Vignar grey-mane will agree to the plan saying you've done a lot for the city.

By the way, you'll be able to find Rikke in Sovngard if you look around. Ulfric and Galmar too if you sided imperial