I think BDing Russ is a good idea, and hey he just said it on the show tonight Jeff's best move would be to get rid of him or Michele. He'll be pissed but inside he'll know it's the smartest thing, and he'll mostly be pissed at himself that he wasn't the one that was able to strike first.
So maybe Russ wouldn't come after Jeff next week, but one more week final 4 and he'd have his ass up. So I think Jeff is just taking a gamble right now. Except for him and Jordan everyone else is gonna be gunning for whoever they can to get to the end. It's a crap shoot whether they BD Russ or just vote out Kevin. Either way there's always gonna be someone after you. If Jeff's in the final 4 whether its' Russ, Michele, Kevin, or Nat in there, he'll be on the block anyway. So might as well take out someone that you know would have an advantage for that final HOH.