I know I'm jumping into the 23rd page of this thread, but has anybody considered that if Saul is immune it may be because of the shot through Tommy and into him? Similar to an immunization shot, getting a little bit of the sickness and letting your immune system build up a natural immunity to it??

Like I said, I'm sorry if this has already been discussed but I don't have the time to go back and read all 23 pages. I'll try to keep up in the future now that I'm current w/the show.