If Jason's EW interview is accurate, it seems the original plan was to split the old Lairos: get Aaron and Missy to flip and vote Elaine, have Elaine and Elizabeth vote for one of them, then, the original Vokai's would all vote for Aaron. They didn't trust him and would have preferred to keep Elaine in the game, with the bonus of having Elaine mad at Missy and potentially willing to come to their side.
That's why there was so much whispering after the Block-A-Vote, they weren't sure if they'd have the numbers (though, they could have!) and decided to just go along with the "fake" plan of voting off Elaine. If they trusted both Aaron and Missy to flip, though, they could have still gone through with the Aaron vote.