The joint interviews stopped ever since GC started rehearsing for Jhalak! Even KS mentioned that GC has been extremely, extremely busy running from one set to another and really we are lucky to getting all these interviews from him. I think the reporters try to catch him wherever they can because he doesn't have the luxury of dawdling around the sets after they have shot the scenes and can answer all the questions at his leisure. I am sure that the PH has had to make some accommodations so that GC gets time to rehearse so everything is rushed and hurried these days!
If you notice in the recent segments GC is outside while KS is still on sets so it's obvious he is constantly on the move! But all said and done I am missing their joint interviews terribly as well and I really hope that once Jhalak is over they go back to giving interviews together because they are so much fun! And on the bright side the 100th episode success party is coming up next week, so fingers crossed that we get a few words from them together, they are after all our main leads!