For a bust to be a bust, they must be drafted high and fail to meet expectations. So, later rounds can’t be busts. So,
Edmunds - Bust
Phillips - Bust
Oliver - Bust
Ford - Bust
The reason why the Bills are in this spot is they don’t hit on rounds 1-3 (outside of Allen). You cannot be an elite team by failing to get elite play out of your 1st rounders. To Beane’s credit, he has found very good players in the later rounds. But all the players listed above would be on their 2nd team if not drafted to play for the Bills.