I think you are right about the ricin. And yes, is Todd a great character or what! Wow,love that he got his uncle to leave one barrel for Walt and when he hooked Jesse to the chain and said “let’s cook”. wow. But somehow I was hoping Hank would make it.
I also think that Walt knew that the authorities were there when he was talking to Skyler at the end just before he dropped Holly off at the fire department. He said everything just right to get her off the hook. I think he was deliberately talking like a psychotic because he didn’t want his kids to be without both a mother and a father.
Yeah, I am still bummed by the thought of Hank just dumped into some hole in the desert. He deserved better.