I see him as a Stormcloak supporter crossing the border and returning home to join their effort, then as he discovers he's Dragonborn, the dragon blood slowly consumes him and turns him into nothing but a power-hungry warrior, hence we see him becoming a vampire in the Dawnguard trailer: he's power-hungry.
As for why he's baking [censored] bread for [censored] kids in the next trailer, hell if I know...
Is that true? Wow. Well hey, if you're power-hungry, you need armies. Armies need people. Kids are people. Kids die without food. It all makes sense now... Though, I guess it would make more sense to hire someone else to bake the damn bread for the little [censored], but judging by the 3rd grade-responses he gives throughout the game and the lack of an intelligence attribute, well, let's just say that's he's not highly revered for his wits.
