Rajat defo isn't entering. I doubt he'll do kkb. But one thing for sure is, cv's would not make ranbir mention his elder brother out of nowhere like that after so many months if they weren't planning on bringing in his brother soon. The only kohli son is defo on the cards, but sad that sunny is being treated like he doesn't exist by cv's still.
If not Rajat, then I hope they don't pair Prachi with the guy. Because if I don't like a couple, I just leave the show and move on, even if it is my fav's show. It may be just a random remark too. Seriously, why don't they even mention sunny. It's like he was never there. His character has much scope. The feeling of betrayal due to his dad, protectiveness towards his mom, giving it back to Aliya, etc. However, as long as they are giving us Pranbir I'll forgive them.
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