I think the only way for them two to both survive this week is if Donny wins veto, Cody puts up Victoria as a pawn, and Nicole works on people like Christine/Frankie/Caleb telling them that keeping Victoria doesn't benefit their games at all since she'll do whatever Derrick tells her.
I don't think Donny would have the votes over Victoria, but I could see Nicole making some headway with people like Christine if she was up against Victoria #bb16
LittleBrother123 Well I'm not putting any faith in this 'theory' as one of Donny/Nicole are definitely a goner this week, but I'm just saying this would be the only way for them to both possibly survive. If Donny doesn't win veto, he's gone, but if he wins veto, Nicole wouldn't have a chance against anyone other than Victoria, and even that would be a stretch knowing these people.