Probably going to get roasted for this, but dare I say Dan Campbell? Love his fire and find him extremely entertaining, but to me he comes across as a rah rah meathead who absolutely needs A+ coordinators (Johnson/Glenn) to pay attention to the actual details and finer points of coaching and strategy.
Also, I understand at least some of the lion’s obscenely high injury rate to key players over the past few years can be attributed to his refusal to ease off during the week in practice to let guys rest and recover. Yes, they’re a tough team that reflects his toughness, but they also seem to live and die on his meathead ways.