Mundane Stud Hi Hand

[PoorLawyer]

I was slightly confused on 5th. I raised a completion on 3rd, then faced the field with a raise on 4th and everyone came along. Now the guy who checked 4th/called 2 bets cold bets out on 5th? It seemed to me at the time that he may have hit something good.

Does anyone's answer to 5th or the river change after i tell you that seat 7 had a 17% VPIP (after about 300 hands)? To me, it makes the hand even more confusing (except that I know the results).