As we can see the the promos, the red zone contestants will be asked to choose a green zone contestant to take their place in red zone. This way all people who were actually nominated will go back to green zone and will be safe. And those who would be in red zone will be nominated( according to how the concept of zones work).
If this is true, then Bigg Boss very conviniently saved Jaan by pretending to do as task which was all in hand of red zone contestants( like seriously it feels like the zone in which Nikki and gang is the green zone lol).