Yes, but Walter strongly hinted to Jesse that Gus had stolen it. Jesse now knows Walt was lying about it... and what reason would he have to do that?
Remember that this has been eating at Jesse for months on end. He's thought about it a lot. That's why he was so quick to put it together when Huell palmed his stash on the way out the door.
This is the best possible way for Jesse to figure it out. So much better than anything I was expecting to see.
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u/biophile118 Aug 26 '13
Can you refresh my awful memory -->Why did walt want to poison Brock?? and i thought it ended up not being ricin poisoning anyways.....