I think Cpdy would definitely put up Caleb because there have already been enough rumblings about Caleb among his bros that he wouldn't suffer backlash for it. Zach has said that he doesn't give a **** about helping Amber or Caleb, Frankie thinks it's a smart idea to get rid of him, and the idea has been in Derrick's head for a while. They all gossip about him and they all know it'd be a good move for their own games. Not to mention the obvious fact that Cody doesn't want Caleb targeting him because of Amber.
Derrick, the cop, will convince them to not touch Donny. He's basically still the HOH.
Derrick has been one of the main ones fueling the Donny distrust fire. If Cody remains HOH, he'll work to get Victoria out over Donny, but he won't keep Donny from being nominated.
This twist is one of the better ones but not with this cast. It would've worked in season 6 or 11 where there was a strong rivalry between 2 groups. For the past few seasons it's just been a strong alliance vs the others.