^They will probably explain it somewhat on the next couple of shows, but here is Jeff's reasoning behind his nominations/POV use.
Many spoilers to follow....
Because Dani had the veto ticket, he knew she was definitely playing, so if he kept her off the block that meant seven people would be playing in veto, which he thought increased his chances of someone besides Dani winning the veto. He wanted to get out Dani this week all along, so if anyone else won veto they were to use it so she would be put up. The reason he didn't just put her up to begin with is that, this way he could tell her that he was sticking to their deal and if she really did win veto, she would never know that she would have been the replacement nominee. If she didn't win veto, she'd be up and gone anyway. So it was a little bit of insurance for next week in case she won the veto. In the event that she won and took Kalia off, they still had the votes to get rid of Porsche.
The plan is definitely to get rid of Dani, but for some reason Shelly is considering flipping to keep Dani. She has been kind of confusing on the feeds and none of us can figure out what her real purpose is. She goes to Jeff and Jordan and says she is definitely with them "a billion percent." Then she goes to Kalia and says she wants to keep her and create a final 4 of Porsche, Kalia, Shelly, and Adam. Then she goes to Dani and says she trusts her and is trying to flip Rachel and Adam to keep her. Then she goes to Adam and says that although she loves Jeff and Jordan, she'll never win in the final 3 with them, so it makes more sense to keep Dani and basically ride her coattails to the end. She then goes to Rachel and says she would be happy with a Jeff, Jordan, Shelly, and Rachel final 4, while she tells everyone else she wants Rachel out next.
Who knows what the hell she is really thinking! I'm not sure even she knows. Either way, her trying to convince Adam to keep Dani will not work, Adam is definitely voting her out. At this point I've accepted that Dani will be gone on Thursday, barring unforeseen circumstances. I was never a huge fan of her, but I do think she makes the show more enjoyable, and I wouldn't have minded if she won.
I'm more interested in the double eviction. All of the houseguests know that one is coming up, but for some reason they are all assuming that it will be the week after this Thursday's episode. They are going to be pretty surprised come Thursday night. Jeff will be upset because he can't play in the HOH, and he keeps saying how important it will be to win HOH during the double eviction. Him and Jordan are both very worried about it, and they never had a double eviction in their season so it will be a new experience for them as well. I have a feeling that if Jeff doesn't win that POV, he might be going home with Dani on Thursday.
Regardless of whether you are a Jeff or Dani fan, I do think that situation would really suck, because they are two strong personalities, and I feel that the house would be rather dull if they both leave. Hopefully we can get Kalia or Rachel gone in the double eviction, but I doubt it.