I think this is close to the answer. The Bills are just really, really good at scouting CBs. There are CBs drafted and released by the Bills still playing for other teams (Wildgoose, Seymour, etc.). They have trouble scouting other positions like WR and RB and maybe MLB but they know how to evaluate a cornerback like maybe no other franchise. Way too early to call Elam a “bust” but it’s certainly fair to question whether it was a smart pick given his skillset and their ability to find corners late who can fit what they want to do.