Rajat for the Trophy.
I believe that if Rajat enters the Top 5, it will be the end for Karan and Vivian. I have a feeling that Vivian might secure the 3rd position, while Karan and Rajat will be the Top 2. Ultimately, I think Rajat is going to win the trophy. Even if internal voting takes place, Rajat is unlikely to be voted out. His chances of winning are high, especially since he is backed by two of the strongest supporters, Elvish and Raftaar, who have a massive fan base. If their fandom votes, even when combined with Karan and Vivian's votes, they still won’t be able to match Rajat’s.
Personally, I don’t think Rajat deserves the trophy from a game perspective, as I haven’t seen him do enough to earn it. I believe Karan should win instead. If Rajat does win, it will remind me of BB16, where people expected Shiv or Priyanka to win, but MC Stan took the trophy. Similarly, while many expect Karan or Vivian to win, it seems most likely that Rajat will come out on top.