Do we know if the prankster is announced in the house or is it a behind the scenes thing? That could make a difference in if the HOH and Prankster work together or if the Prankster does their own thing and puts up like Michie to throw a wrench in it.
Honestly the only person that would put Michie up at this point would be Christie. Tommy's smart enough to think about jury management and knows Michie is a threat and someone else will do the dirty work for him