Walt definitely poisoned Brock. It's foreshadowed in the previous episode where he spins the gun and it stops facing the lilly plant. It's confirmed in the finale when they show the lilly plant at the end. Walt had no choice. The only way to outsmart Gus was to play at his own game. Walt had to win back Jesse by manipulating him into believing Gus poisoned Brock. Huell lifted the ricin cigarette when he frisked Jesse in Saul's office, and I believe Saul poisoned Brock when he gave him candy on Walt's command. The past season has really shown how out of control Walt is. He's completely lost all sense of right and wrong, and will do anything to remain on top / in control. I think season 5 will be really exciting. I predict Hank will finally discover Walt's involvement with Gus, and Jesse will wonder what happened to the ricin cigarette, and will realize that Walt ultimately poisoned Brock. I hope Mike makes some appearances too
. He was way too involved in the story to just get dropped.
Edit: I think it's crazy how he's wearing the same green colored shirt that he wears in the first episode. I think it shows how he's come back to square one. He's a little richer, but has no cook gig and his family is still completely torn apart.
Fuck i'm way toooo into Breaking Bad
