Actually, in my view, over the years there have been several WTF picks (Eric Flowers, Maybin, trade up for McCargo, Whitner over Ngata, Spiller when you already have a RB and have other holes, EJ at 16, trade up to take TJ Graham as 3rd rounder when projected as 5th round pick, Roscoe Parish, etc.) that were failures where the Bills picks could've been better if they used someone's mock draft.
The history of this team's management has not been a situation of "everyone misses on a couple".