I highly doubt either of the two nominees go home this week.
Of the three potential backdoors, I rank them as follows (from most likely to least likely)...
1) Zach
2) Victoria
3) Derrick
Frankie is HOH.
Christine and Donny are safe.
Zach is going home unless he wins POV, IMO. (Fun story too 'cause Frankie will be the one to put him on the block.)
On the off chance he doesn't, it will get murky.
Likely Victoria goes up against whomever Zach doesn't take down from the block. Cody is likely safe but Caleb vs. Victoria could provoke "discussion".
Frankie putting Zach up would be so entertaining. I think it'll be Victoria though.