[KC_Connection]

You can argue that Gale wasn't an innocent, but what about Brock? Walt may have convinced Jesse with his story (that was an brilliantly acted scene, btw), but he didn't convince me. I don't think it was Gus that poisoned the kid at all, he had little motivation. I think it was Walt.

Edit: Went back to watch the scene with him spinning the gun (before inexplicably disappearing for half the episode). The gun points to a plant on the 3rd spin (that he stares long and hard at). Ricin comes from castor oil plants.

I suppose we'll know soon who did it, but as I said last week, Walt is capable of pretty much anything at this point (especially when his or his family's lives are in danger). Manipulating people as pawns (particularly Jesse) is something he's become very good at.