Competitive Rank Glitch

I was playing a low master/high diamond game and I came across a player who was supposedly Rank 27. I was surprised because our team avg SR was 3580. When I looked at his actual rank, it turned out that he is only diamond. Did anyone else encounter someone like this? Or am I going crazy haha.

Edit: Checked the other regions and still can't find him

Pics: http://imgur.com/a/3yFs2