A key part of any strategy, whether it be in business, war, or a game of chess, is to put yourself in the right position. Amanda is as good as anyone in doing that.
Who did Tom go to when he needed to talk to "the powers that be"? Amanda.
Who did JT first talk about booting Candice to? Amanda.
Who did Cirie need to convince to not boot Candice? Amanda.
It was Amanda who was at the center of the James-Rupert, JT, Cirie-Candice alliance. Make a web diagram of the tribe. Amanda is at its heart.
That all being said- if the Heroes lose another challenge, I see the men sticking together and Candice or Amanda going home. Basically, whoever JT would rather be without. We'll see.