re: What do you think is wrong with defense?

That’s probably true, but the problem is his philosophy is flawed to stand up against high tempo spread offenses. His entire scheme is built around “read, then react” playing. Offenses are too quick these days to play reactionary defense. Pelini got torched at the end at Nebraska and his defenses always looked like they were 3 seconds behind the play. His scheme involves too much thinking by the players