I'm in agreement with Estee.
Put plain and simply, the Rats want to see a Frank, Ian, Shane and Danielle F4.
I'm sure they thought they'd lost those chances when Frank decided it would be best to try as hard as he did for the Veto.
After virtually destroying his own chances, the only way to save Frank from himself was to have the QP self-destruct. But how were they gonna do that?

Then Dan spends 24hours in solitude and comes out claiming the QP is dead! (Hmmm...strange.)
Yes, it saves Dan, (and from our perspective ends up coming off as a brilliant self-preserving move) but moreso it gives the rats more chances to save both Frank and Ian at the same time.
I'm sure they would rather have Joe and Jenn on the nom chairs but if Brit goes now, that's okay too. Or at least it's a necessary evil.
As far as the rats are concerned, Dan just saved the storyline.

And again, I must caution you from thinking, michel. We all know... and would rightfully choose Danielle as the evictee. She's proven to be challenge worthy, she stays off of everybody's radar and also comes off as capable of receiving votes in the end. To me, that spells danger.
At least with Britney in the house, the rest stand a chance of winning. (and true to her resourcefulness, Brit made herself party to both Frank and Ian this week.)
But Danielle and Shane's story is also high on the roster. It hasn't broken yet and they so desperately want something to break. Unlucky for them Shane is incapable of free-thought. But Danielle is going above and beyond their expectations.

So in essence, Dan just saved the storyline, so he gets a temporary pass.
The storyline is Underdogs versus NoMance. Britney does not fit into either of those storylines nor can she influence the other variables in Joe/Jenn.
My from the ether prediction... Stupid Hamsters do as Rats direct and Brit goes this week, Joe gets front-doored next. Dan get's backdoored the week after and Jenn holds the solo spot as possible last minute upset. If she succeeds I completely expect Shane to fall on the writer's sword. F4 of Ian, Frank, Shane/Jenn and Danielle. And if any of the remaining are worth any iota of the wreck that is BB14, Rats will insure Ian does not make it to F2. I'm calling a Frank versus Danielle finale. (All the more reason why I should just stop watching NOW.)
Danielle doesn't win and oddly enough fades into obscurity as one of BB's most worthless players, while Frank secures the adoration of BBfans as the man who never got to make a vote and yet received the votes in the end. (Yes, they will completely glide over that 1 vote of Frank's for....who was it again?)