Look, the system is different in intra-channel and inter-channel. Two shows can compete each other in one channel and one show might get higher rankings than the others (like KY2 got at first compared to Splitsvilla and all) but KY2's webs are stretched far and wide and it's TRP's against Sadda Haq's TRP's are counted differently.
This was what I was taught in college.
Anyway, it could also be the channel's way of sucking up to VG. It's like, "Dude, see you show is on top in such a short time" and indirectly saying "dude, you've got what you wanted now STOP messing around with our no. 1 show".
My money is on the latter theory.
This "success party" comes sooon after VG and even MTV are bashed left, right and center. MTV cannot afford to lose MaNan viewership like that as they're practically their rozi roti. They played their cards close to their chest.