Apart from entertainment factor, BB is sending them together either to clean Prince's image or to taint it even more. If Yuvika says that I made it clear to Prince before I left the show that our future together is not possible and I have no problem at all if he want to start a life with Nora then all those who were accusing Prince that he did showmance and proposed two girls in one show won't be able to say anything more but if she said something against him then those accusations will be proved.
I'm personally feeling that she will pick the first option and will say that she refused Prince and thus he moved to the other girl. It's good for her own self respect and image too as she won't be remembered a girl whom Prince ditched as soon as he saw another girl.
btw this whole thing is reminding me Diandra coming to BB house to free Gautam from all the accusations that he used and ditched her.
ps. If SuKish ever came back and said that they are perfectly okay with Prince decision of not quitting the game then Prince image will be as clear as he's born just today.