Agree with Bini about scene in tea stall. Never for a second I felt something is hinting to Vikor angle and to be even more precise never felt something is hinting that Vivaan will have his own reason for enmity with Suraj. Even when holding him he remembered words of mystery women there was in my pov nothing personal. Vivaan just tried on not so good way to open Suraj's eyes before its too late and Suraj will get embarrassed in front of Chakor or maybe he will feel so much guilt for not beliving her that he won't be able to look at her eyes.
About Vivaan thought proces and recollecting memories. Yes it was all memories from Suraj's grey phase... but the way Vivaan said Suraj didn't changed didn't sound to me like he was angry because of that. Maybe it was because of exercising or because of whole scene but for me the way he said it sound so casual. It gave me impression like the continuation of that dialogue will be : " You were always impulsive and you are still." Which is partialy right, today's scene reminded on shades of old Suraj. When I think about it, Vivaan never really got opportunity to see how much Suraj changed when it comes to his temper. He never got to see how much Suraj become calm and composed after he fell in love with Chakor. Bandhua track and then baby 2 track, the period before baby track and Imvaan fiasco and everything that come after, was to short for some good bonding between brothers. Focus was on making Suraj n Vivaan reconciliation but there was no bonding after that. Vivaan never really got opportunity to know the real changed Suraj. And now he is seeing shades of old Suraj which for us are reasonable but for him isn't. What I want to say... the dialogue and whole that scene could be interpreted like casual constatation that Suraj didn't changed some of his characteristics not whole personality.
But I know makers defintely have something other on their mind and that they are probably giving hints or preparing stage for next track in which Vivaan won't have role he is having now, means they will probably find reason for Vivaan to hate Suraj which can be related with Chakor but not in the terms of Vikor angle or love triangle.