Communication. Starts and ends with communication. I was blown away by Alabama's pre snap communication. Not just between the front 4 or back 7, but also between units. Hand signals, yelling, pointing, etc. It starts with Kirby Smart. He's on the field basically helping make pre snap adjustments. The offense doesn't know what defense they are in or where the blitz is coming from because it's not predetermined.
OSU doesn't communicate well. They don't have the tools to do so. OSU is terrible at switching responsibilities in zone coverage. Their spacing isn't right, some of the time because they were faking a press or a blitz, or because they didn't adjust to the formation.
It falls on Fickell. But I vote both because you can't blame coaches for poor tackling or getting run past by a TE.