1. Kishwar: It makes the most sense for either her or Prince to press the buzzer first and the remaining stays till the end. That way they can both stay in the game. Logically, it would make sense for Prince to get out first since he has an immense fan base to take him to the finale anyway. But knowing prince, he won't be able to strategize like that so Kishwar will do the thinking and take the fall.
2. Mandana: Couple of reasons to think why Mandy would press the buzzer second and leave the house. First, she is a bhukkad and probably cannot handle not eating and drinking for a longer period of time. Second, her movie is coming out and she probably needs to be out for the promo of the movie. It might just be scripted this way since the plan may have been to evict her but since she escaped nominations this is an innovative way to make sure she leaves.
3. Prince: As I mentioned above, it makes the most sense for KP to be first and last to keep their team intact with both benefitting. The precap may have been misleading and prince may have pressed buzzer first but no way would it make sense that BB would let Prince go since they stand to make the most from his votes in the finak weeks.