I would disagree at least to the extent that in-game trends relate to DB play. I think the staff knew quite well all of the problems it had, and did what it could to mitigate them, but at that point it is entirely too late to do anything about them. If you want to blame overall poor DB recruiting from 2010-2013, I would be on board with that, and to me that was the staff's real shortcoming.
Otherwise, if I'm looking for culprits, I'm zeroing in directly on QB play -- namely zero deep passing success until the late fourth quarter touchdown to White, plus two ugly interceptions that combined to cost us 14 points -- and the D-line, which was oddly enough pushed around pretty badly by Ohio State, despite being the bedrock of our defense all season. Really haven't seen much of a satisfactory explanation for why that happened, although the thin LB corp and the injury to Ragland certainly hurt matters late, other than to simply say that they didn't get the job done and were just outplayed.