It didn’t take Nebraska long to find a replacement for former defensive backs coach Evan Cooper. The Cornhuskers are expected to hire former Bills assistant coach John Butler, according to Pete Thamel. Cooper surprisingly resigned from his position on Friday. John Butler also has NFL experience with the Texans. “Sources: Nebraska is expected to hire former Buffalo Bills assistant coach John Butler as the program’s new secondary coach. He’s a longtime NFL defensive backs coach with stints at the Texans (2014-17) and Bills (2018-23),” Thamel posted on Twitter. This isn’t the first time that Butl…