To start with Sunil Grover left the show putting the current crew of Comedy Nights With Kapil in distress. With his return it is possible he might put them in more discomfort until at least things return back to their usual routine.
-Sunil Grover's not returning on the show as Gutthi, though we have seen him in other avatars, the frenzy that surrounds him might not be the same when he plays other roles on the show.
-When Gutthi, Sunil Grover, left the show, after a bit of a struggle, other characters started to gain attention. Like Dadi, Ali Asgar, who was quite loved on the show, she did not get as much popularity when Gutthi was on the show.
-The same goes with Palak, Kiku Sharda. The character started off as Gutthi's partner has now become as popular as Gutthi and is currently even roped in to contest in Jhalak Dikhla Jaa 7 as the on-screen character. Will Palak be able to stay in limelight when Gutthi returns to the show?
-Though Sunil and Kapil are good friends, after leaving the show half hazardly, there is a chance it might not be the same when he returns.
-After all that has happened, what if the channel decides to play around a little with Sunil and not give him as much screen space he used to get when he was previously on the show?
All these might be imaginative and hypothetical situation that might not even happen, but what if it does?