By Daniel Bates New Ohio State defensive coordinator Jim Knowles is already getting frustrated at Buckeyes practices thanks to Heisman-finalist C.J. Stroud. As Knowles continues to install his defensive schematics, the Bucks DC explained that defending Stroud on the practice field is a nightmare; because he’s so easily able to diagnose what the defense is doing. Knowles even went as far as comparing the sophomore QB to a former player he used to go against in practice: Eli Manning. The 56-year-old served as a linebackers coach for Ole Miss back in 2003; the year before Manning was drafted firs…