邪恶力量 discussion?

Hi guys, I was wondering if 你 guys had any opinions on something I've been wondering about. This might have been a long time ago, but if 你 remember back to I think the season 8 opening episode, Sam leaves Amelia and sneaks out quietly. If 你 recall, there is a figure in the shadows watching him as he drives off. Any ideas on who it could have been? I've eliminated a few people myself.

-Dean: he did not know about Amelia until Sam brought her up, and he was at the 舱, 小木屋 too so he can't be in two places at once
-Bobby: he wasn't alive
-Castiel? I'm not sure about him, was he saved yet?

And do 你 think that the figure is evil 或者 good?