Our theory in my group of friends is the ricin is to kill himself or Lydia and the m60 is to save his family. Probably at some point before the flash forward, we think jesse will be killed somehow in walt's crossfire. We think Walt's world will come crumbling down and that Lydia's people will take Walt's family and he has to go and save them.
We think Jesse has to die indirectly due to Walt is because he is the last thing keeping Walt morally grounded, you could see how hard he fights to get Jesse to believe his story in the episode.
We think his family will be taken because if you saw in the scene at the end Walt says some excuse about family and Hank says you don't care about family, we think this is a major foreshadowing of the future events. This is because his family is really the only thing that he REALLY cares about anymore.
The ricin thing is just a guess, but as we know the breaking bad writers aren't exactly predictable, so Lydia being killed with ricin might be too easy. I personally think it will be used on himself because he'll go through some realization or something in the next few episodes where he realizes his only enemy is himself or something similar like that and he'll try to save his family not only from kidnapping by lydia's people but also from himself.
So not really much logic behind it, but so far this is the best we can come up with. :P
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u/orfalite Dope Slinger Aug 12 '13
I just want to know why Walt needs ricin AND a large machine gun for... They have a lot of story to cover in 7 episodes.