I am thinking too that Twila has other plans. I remember hearing her say to Julie something about "five sticking together". So, a possible "five" could be the three men and her and Julie for the next vote which would be 5 against the remaining four women.
This way, she blind-sides Ami who thinks she has all the women tied up. She didn't clue the men into this plan because obviously they were totally shocked (Chad's face was priceless!).
If this scenerio is correct, she will need to inform the men prior to the next IC of this, IMO.
But I could be wrong and the "five" that she spoke of are her and Julie and 3 other women (perhaps Scout, Leann and Eliza). They could plot to go along with Ami eliminating the men and then Ami. Twila could easily beat the remaining four women in challenges.
Who knows? It could be something totally different from anything any of us thought of.
Actually, I guess I should just come out and admit it.... I am hooked once again to this show they call Survivor.....