I think Frankie is loyal to Christine and Zach but Zach is a time bomb that Frankie can't keep defusing. Like this morning in the HOH with Devin, nothing he could say could sway Devin to not put up Zach. You can see his frustration when Devin walks out of the room (flashback 10:43am BBT) . People keep saying he is throwing Zach under the bus but I really do not believe that he is, Zach is doing a good job of that himself. Zach hasn't slept or really eaten in over 24 hours and is punch drunk....not a good thing in the BB house.