The Buffalo Bills got their running back, selecting James Cook at No. 63 overall — the second-to-last pick in the second round. But Can Cook take over lead duties from Devin Singletary? The Bills have done a decent job running a real-life Zero-RB team over the last several years, getting strong production from Singletary and Zack Moss (both third-round picks) with fill-ins by Matt Breida (an undrafted free...