I actually think that Sophie and Albert not flipping is an excellent choice. Of course as a Dawn supporter, I would have WISHED for them to do so, but strategically it's just not a smart move. You see, while you save Whitney and Dawn, which probably gives you the probability of 2 votes at tribal council, you screw over Edna who won't be voting for you. But the fact is, you screw people like Brandon and Coach, who... "deems LOYALTY" so much (Although I think they're just bullcrapping) and will probably find reasons/ways to get you out even BEFORE Whitney and Dawn if they did stay over Edna. Strategically, it makes ABSOLUTE no sense to go with Dawn and Whitney, since Albert and Sophie are definitely not at the bottom of the totem pole.
What would make more strategical sense would be for Edna, Rick and Cochran, who're definitely not running/playing/in danger of moving even further than F6, to work with Whitney and Dawn to make sure they make the FINAL 3. You see, with the power of 2 from old Savaii, the 3 can join forces and then vote out the other players who seemed to be "running the tribe" and has a shot of winning.
BUT, that probably won't happen because they are simply not playing the game. Which results to... us... viewers... watching... a...boring.... season. Yep.
And going with Whitney and Dawn, helping them to move a step further, by screwing Edna... but with NO intention to bring them further than the F6, doesn't necessarily win you their votes as well.
Look at how Sugar screwed her own game by simply going with whoever she wants to in Gabon.