I was playing with my girlfriend on a custom game of Borough Grief last night against two of my other friends.
She went in the game as a 2 bones rank, came out with a skull rank.
So it is pretty obvious that versus stats do in fact still count.
Just thought I'd put that out there.
From what I have heard, you can rank up in Grief but you can no longer be de-ranked, or at least downs won't count against you in the same way as they do in solo or co-op. But there are so many different opinions out there, I don't think anyone knows for sure.
I'm not saying how it works, because I don't know for sure. All I know is she ranked up in grief so versus isn't completely negated.