Love JT but as I think back I do recall the team not performing up to their talent level more often in the last several years then in the earlier Tress years. Imagine Cooper's teams. Tremendous talent, but often never played up to their potential. Tressel certainly got the team to play to a high level and up to and perhaps a little past their potential; however, I think it started to slip a little near the end. With Meyer, I get the sense he is not going to put up with that and will make changes for underperforming players/coaches, e.g, A-B/4-6. This is more of a gut feel than anything else I don't have any stats to back it up.
Quit edit: And I don't think anyone can disagree that Meyer had the players perform WAY above their level in 2012. If he fixes the Defense this year, we could be in the playoffs.
Bottom line: to me the best coaches are the ones that get the most out of their talent ala Dantonio