Yeah, this is... pretty much what I know about so far too. I guess Spike will for whatever reason manage to find Angel first/earlyish and then go ...wait a second, you totally aren't evil, then they can have one of those on the run from the law for something I didn't do parties with the goal being to get to Caritas?

People are welcome to doubt Spike's somewhat tenuous good guy status as well, since why the hell would be be teaming up with Angelus if he was good.