On Monday's episode we saw KV telling to his new group that which were side their team goes that side will be heavy!
In such a situation, kV is in red and Rohit is in blue.
We see KV telling to backstab blue team and this is an evidence that KV's group won't survive long.
He played a safe game.
He know if the blue team wins they are higher chances of making Rohit being a captaincy contenders along with jas.
Blue team thinks about nominations (based on old episodes) and then select the captaincy contenders.
KV wanted to show he gave a masterstroke to the game.
By making Rohit agree he got the required from HC for being in the captaincy race.
Another reason can be, if Rohit becomes one of captaincy contenders from blue team, Rohit will somewhere get close to blue team and KV thought and then it will not be that easy to influence Rohit.
So this is so called "game changer" talk with Rohit.
And I would say it is only KV's personal revenge kind of stuff was visible to mein the entire backstabbing episode