Killing Softly: End of Season 2 answers (most) questions

Probably will be spoilers here, so beware - conclusion of Season 2 of The Killing very effective and much more satisfying that conclusion of Season 1, which left wide open questions and resolved nothing. At end of Season 2, we do know who killed Rosie Larsen, and the killer's identity will, I'm pretty sure, surprise all viewers and at the same time make sense within the parameters of this sometimes unfathomable plot. I'm not sure I buy into Jamie's willingness to attack and beat up Rosie, much less to chase her through the woods; not sure I believe he could or would tie and bind her and dump her in the trunk of the campaign car. Not sure I understand how he could have summoned Ames to the scene of the crime, or why. But Terri's presence along with Ames makes sense, and her role in the killing is very surprising and haunting, and I'll leave it at that. Clearly, the team producing the Killing wrote this season as a likely conclusion, while leaving loose a few strands that can draw us into Season 3, which is out there waiting (though not yet on DVD): Why does Richmond so quickly patch things up with the developers and the Indian tribe, in fact why does he spring Ames and Jackson from jail? He must have a deeper motive. Who's body has just turned up near the airport - any connection to this case? In any case, both M and I found Season 2 of The Killing totally engrossing, despite its many manipulative false leads and improbabilities (Rosie in no way seems like a troubled teen who would run away; how could she be working in a casino without her parents' knowing?; isn't the coincidence that brings her together with Terri at the end a bit beyond belief?; could Jamie be as crazy as he seems at the end? - he sure his that side of himself for a long time). Lindon/Enos is a great, strong, if somewhat opaque character; sidekick Holder/Kinnaman grows into the role and becomes increasingly important as a counterweight to Enos's solemnity and focus. I would guess Season 3 will focus even more on Seattle politics, which can be a risk, as at hear this is a police procedural and not a political drama. I'll watch, though.