Easy...Jeremy is bullying people to vote Elissa, Nick has no vote, Howard and Spencer are brosephs so they'll at least know between the two of them who voted the wrong way (McCrae)...and so it would only be getting to the inside of that relationship to really discover who from the Moving Company broke step. So who would come after McCrae if Nick goes out?...the strongest competitors in the game...Jeremy, Spencer, and Howard...along with some floaters GinaMarie, Aaryn, and Katlin. If either get HoH, McCrae just wrote his ticket home because they will for sure put up two out of Helen, Andy, Candice, Elissa, Amanda, Judd, and McCrae, and they won't have the numbers.
I think it would be incredibly stupid for McCrae to break step against their alliance, which contains the most competitive people in the game. He will have effectively aligned with the weakest and muddiest alliance in the house, and everyone will know he was the swing vote.
Unless...Spencer and Howard move in McCrae's direction instead of Jeremy...since he has been putting people off with his demands. But that is super risky, because Jeremy will expose the alliance (which is a powerful card) and they'll have to start from scratch.