Adam is going to go with whoever wins the next HOH, the same could probably be said for Shelly, if she stays.

You can't really know what Shelly is thinking because she never tells the truth to anyone but she might want to redeem herself in Jordan's eyes and stick with Rachel/Jordan. But again that's a risk because Shelly has turned on them once, why wouldn't she do it again.

Also voting out Adam burns a jury vote for both Rachel and Jordan.

As much as I dislike Shelly, if she somehow ends up staying...she's playing the best game in the house without winning anything!