I don't understand one thing that when RK knows that Sultan is a gangster why doesn't he inform the police in the first place? we all know police will listen to him as he is a superstar.
And one more thing, is Sultan really a gangster? CVS have shown him as the leader, and this is his intelligence level? He just went to the party just by receiving an invitation card from an unknown person. He did not even have doubts regarding it that it could have been a trap by police also?