I feel he is KD's unofficial spokesperson
KD can't say few stuff due to his public image so Karan does it
Saamp bhi marr jaaye aur laathi bhi na toote
Otherwise KD would have definitely refrained him from his professional life..
It's something we will never know. From his live, he comes off as someone who do his own.
E.g. if you know you're sharing a room with your bro, who came home around midnight, wants to eat and go to sleep, why keep "live" at that ungodly hour, and ask him to say hi for a couple of minutes when all he wants to do is go to sleep?