Sid rashmi sana asim are top 4 and looking at current situation I think now asim has the max chance to win. Sid and rashmi are big star of tv and had fan following even before entering the show but sana and asim ko koyi janta bhi nahi tha. They raise with BB. BB is favoring sid and Rashmi from the beginning and even sana enjoy it because she was able to generate content and viewership with her different personality (either people like it or hate it) she mange to catch people attention but the real underdog is Asim. No one knew that man can come this far. He didn't have fan following to vote for him even if he goes wrong nor he had that unique personality that catch attention quickly like sana. He is handsome boy who come bb to build his career. In start people see him as sid friend or side kick(what ever you like) BB completely ignore him. They also didn't thought that he can come this far. Slowly he started to show his individuality and started to win the heart and see now he is in par with sid rashmi and sana baki love log tho competition me bhi nahi hai.
Sid lost his chance with his violent behavior and bb's open biasness did more damage to him than good. Rashmi still I am not able to understand her character but she is par with sid in term of language and anger(I am amazed abhi tak issne inta gussa and yeh personality dabake kaise rakha tha😲) sana reduce to sid's love interest or sid sana paras love triangle.
Janta loves underdog story and asim is the one. A man who didn't have anything when he enter the house, BB never support him. now he is fan's fav. Max people either love him or neutral toward him. I am sure max people won't mind if he wins. BB started to a acknowledge him. Celebs started to love him and support him. Season 8 GG was also underdog when he enter the house. He was not popular like other celebs After him asim is another underdog who is actually fans favorite❤️