It should.
Yeah, there were a lot of theories about the ricin. One I read was Walt was going to put it in the meth to ship it off so people using it would die, but looking back I didn't see that one being likely. I never really saw Lydia as much of a threat to Walt, so killing her seemed kind of weird, but I kind of understand why he had to do it.
What did you think of the finale? Has your opinion on it changed? The first time I saw it I wasn't a fan, but I've rewatched it(several times...) and I definitely love it a lot more now