Fields easily had his worst day as a Buckeye yesterday. The one weakness in his game before yesterday was that he held on to the ball for too long, but it was acceptable because he had thrown for 41 TDs and 1 interception in conference play before yesterday. Yesterday, he held on too long, but made bad decisions after he had done so. It's only one bad game in his 18 starts, so I'm not concerned about him.
Ohio State's offensive line bullied Indiana's defensive front in the running game all day, but Ryan Day got too cute with his play-calling, and called far too many pass plays. Ohio State would have blown the Hoosiers out, if Day would have called more runs, then called play-action passes to take advantage of Indiana's DBs cheating up into the box to try to stop the run.
Ohio State's secondary is a problem. Three DBs off of last season's team are starting for NFL teams now (two first round draft picks included), but they have not been replaced by good or experienced players. Moreover, Jeff Hafley, who did a great job as tOSU's secondary coach and co-Defensive Coordinator last season, was hired as Boston College's head coach, and is sorely missed. Ohio State plays a lot of man-to-man on the perimeter, but doesn't have the athletes to play this way successfully at this point. Not good enough to win in the Playoffs at this point, anyway.
I'd disagree with MichiganHerd's comments about Ohio State's line play. The big uglies up front opened up huge holes in the running game, and only struggled in pass protection when Indiana blitzed multiple guys and Fields held on to the ball for too long. The Defensive Line doesn't have a stud like the Bosa brothers or Chase Young, but played fine yesterday. They were great vs. the run (Indiana didn't have a single yard rushing), and although they didn't pressure Penix much, Penix has a very quick release, so it's hard to sack him.
I watched the end of the Michigan/Rutgers game. Schiano is the only coach who can make Rutgers competitive at all, but his staff chokes at the end of close games. After Michigan missed a FG in the first overtime, Schiano's O-Coordinator called the dumbest series of plays imaginable, and ended up losing two yards, making his young kicker's FG attempt longer than it had to be. I see why Rutgers lost so many close games to WVU when Schiano was at Rutgers the first time.