1. Jim Knowles left Ohio State and went to Penn State. This one is a doozy. Speculation was that Knowles and DLine coach Larry Johnson butted heads. After the regular season loss in Eugene vs Oregon (where Nick Saban after the game literally told the world that Ohio State's pass rush was out-dated and vanilla) Ryan Day sat the defensive coaching staff down and told them changes needed to come. Knowles had to defer to Johnson regarding the DLine for 2+ years regarding style of play and player rotation, but he got his way now, and the pass rush the rest of the season was greatly improved. Apparently the bad feelings were still there, and Knowles moved to Happy Valley. Larry Johnson is a fantastic DLine Coach, universally regarded as one of the best, but I sincerely hope Ohio State doesn't revert to vanilla DLine play. 

2. Chip Kelly did Ryan Day a solid and stepped into the Offensive Coordinator job after Bill O'Brien took the job last winter, then left for the Boston College head coach job. Apparently it was known that Kelly was a short-term fix all along, and Kelly left for the NFL to take the Las Vegas Raiders OC job. Ohio State's WR coach and recruiting savant Brian Hartline gets his chance at calling plays with the promotion to OC. 

3. OLine coach Justin Frye also left for the NFL, taking the OLine coach job for the Arizona Cardinals. One one hand, Frye did a very good job developing linemen during his time in Columbus. Lost in the national title run is just how decimated the OLine was during the playoff run. An argument could be made that they made that run missing their two best OLinemen. But on the other hand, Frye was not a dynamic recruiter. He struggled getting quality AND quantity regarding high school recruits. Too often Ohio State would miss out on top recruits, and too often his recruiting classes were small, hence why the Buckeyes have had to depend on the transfer portal so much lately. (There two new starting tackles next year could be new transfers). Ohio has a very good OLine crop, and hopefully the new OLine coach can grab as many of them as possible. Who is the new OLine coach, you ask?

4. The new OLine coach is Tyler Bowen, from Virginia Tech and previously Penn State. He is a former college OLineman, and is considered an excellent recruiter. At Penn State, he was successful in recruiting many highly regarded high school OLinemen that had very good careers at Happy Valley, and apparently he had a hand in recruiting a three star TE from Virginia that is very popular on this board with a few of us - Tyler Warren. Time will tell if he's as good of a developmental coach as Frye, because if he is, he'll be a fantastic hire. 

5. Speculation I've heard is that Day is waiting for the Super Bowl to be over so he can hire the Kansas City Chiefs DLine coach Joe Cullen as his new DCoordinator. He's coached under Steve Spagnolo for three seasons, and under John Harbaugh as his DLine coach in Baltimore for five seasons before that. Between the Ravens and Chiefs jobs, he was Urban Meyer's DCoordinator for one season in Jacksonville. Cullen has a long coaching history, but might be best known as the former coach with the Detroit Lions who struggled with alcohol problems and famously ended up in a Wendy's drive thru butt naked and black out drunk back in 2006. It isn't certain Cullen is getting the DC job, but it has been pretty quiet for about a week regarding it, so that kind of points to Cullen as being the guy.