'Maybe the most intriguing element is Ragland. Of the trio, he was considered the most specific fit for Ryan's 3-4 defense. As the Bills search for Ryan's replacement, there is speculation they might either end up with a defensive coordinator (such as former Jacksonville Jaguars coach Gus Bradley) who uses a 4-3 scheme or a head coach with a defensive background (such as Carolina Panthers DC Sean McDermott) who also uses a 4-3.'