I just can't see Michael being suddenly interested in Estelle. It just seems too coincidental, that when they no longer nom, so it can't go against him with the other HM's picking him for it, Michael decides he has an interest in the one person who has been saved tons and who he's sees and states has the power. To me, everything Michael does is about getting public support. It's about playing the game and like his chess analogy, making the right moves. I think his interest in Estelle, is all about this. It's the best move to make, to make the public feel that his constant slagging her off and nomming her, were just him doing some sort of reaction to how he feels about her. Bull plops, I just don't believe it!
Estelle herself, really does think she is the fairest of them all, so I guess she's happy to go along with it because it's an ego boost and seeing as neither Josh or Sam were interested, Michael will do. After all, she was heart broken apparently over what he said about her and for someone who bangs on about keeping it real and being truthful, she seems to have put that to one side re Michael and what she thinks about him.
To me, for Michael it's the next move in his game plan. For Estelle, it's an ego related move, that reminds us she is the fairest of them all. After all, look at Zoe, pining for Michael and nothing. She makes one offer of a spoon and he's there. . I'm not saying they hate each other, but it all seems too convenient at this stage of the game.