because she is Rahul's favourite and it is about him choosing whom he likes..
Agreed he has his right for fav but, there r other girls too. if he decided on her why all this drama? r others fools to continue on show and make fool of themselves i don't agree with that, u have to be fair if u really want to choose a girl as u claim only after knowing others based on the format of the show. otherwise do not make such shows misleading viewers and other contestants.