‘McCarron’s college center, William Vlachos, is an offensive assistant on the Bills’ coaching staff, so he helped with that recon. So, too, did offensive coordinator Brian Daboll, who spent last year in the same role with the Crimson Tide, giving him a pipeline to some of the people who know McCarron best. There also were conversations with Cleveland Browns coach Hue Jackson, who was the Bengals’ offensive coordinator through McCarron’s first two seasons in Cincinnati. And with Browns quarterbacks coach Ken Zampese, who was the Bengals’ quarterbacks coach and offensive coordinator while McCarron was with the Bengals.’