[Alpertinator]

OP you are right. I had this train of thought a couple times all ready, it's true. Sam is kinda' stuck in a paradox. The other housemates, knowing that JJ, Dave and Josie can't nominate Sam, are probably more likely to nominate the guy, he'll surely be up. If by some miracle he isn't up however, he'll surely be picked in S&R... unless shortly before S&R BB announce that Sam cannot be chosen.

So Sam really needs to win S&R.