Trivia before the show.
From Jokers:
Rach: Just because there are 2 of them in F4, does not mean they both get to F3. With D and P they can be BFs, and start to take out everyone.
Shelly: Then we are still in the same boat.
Rach: Who is to say that, I have a feeling, that D would turn faster than JJ. She may be like sorry guys, you gotta go Rach. And I will be like what happened?
Shelly: That is the thing, they can swear to God, but once their HOH, they don't care and say its just a game.
Rachel: There are pros and cons. It could be a stupid move.
Shelly: Ya, I know.

Rachel: Daniele would turn on me faster than jeff and jordan
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That is exactly what I'd been talking about. Dani will only protect Porsche and take her to the end.

I think by Rach throwing Shelly and Adam under the bus JJ will want to stick with R.