I think Udaan's benchmark should be IMMJ, Colors will expect Udaan to be slot leader.
About the slot change, it's hard to tell, YHM's story at the time it was moved was a mess (making the leads grand parents fighting over their dead son love child), so the drop wasn't just because of time change, it improved a little but it's falling again, I think it's partly because of the track and partly because it's difficult to get anything above 1.8 at this time slot.
It's too early to judge Roop, BP, and Silsila, but BP and Silsila held well.
I think if Udaan comes up with a good track that focuses on Sukor, it'll do well but that's a big if, recently tracks have had a sluggish start. IMO it's good they moved track climax to next week.