Khalil Mack remains a very large mystery when it comes to the Cleveland Browns' draft plans. Mack was the standout linebacker for the University at Buffalo whose draft stock in the eyes of NFL types has remained consistently high. Merrill Hoge calls Mack the best football player -- not workout warrior or speed demon -- in the draft, and those projecting the picks consistently have him in the top 10, with some putting him top three or four. Browns coach Mike Pettine described Mack this way at the NFL owner’s meetings: “Explosive athlete.via - NFL Nation