Why did Knowles leave for PSU? | Likely candidates to replace him? | Chip Kelly next?

Well, we thought there was a good chance Jim Knowles would not return as Ohio State's defensive coordinator next season. But we did not initially see him jumping to another Big Ten team. However, on Sunday, it was revealed that Knowles will take the same position at Penn State. What led to this? Who are some possible candidates to replace him at OSU?Dave Biddle and Dan Rubin cover that and much more on the Monday 5ish.