I guess the makers plan to keep the viewers on the edge. So raghav signing the divorce papers is high likely, otherwise the story won't move forward, but how Raghvi handle it will be a treat to watch. Either they burn the papers, or etc.
But still hoping the writers shows a smart Raghav, we need the Don to put a stop to Kirti doings. I mean hopefully there will be a smart twist, like he actually knows the divorce papers are placed, still signs them, but makers shows a twist that the signature disappears when Sunny giving the papers to Mandar. Like make Sunny's popat. That will be a treat to watch.