Dan Campbell is a caveman in the modern NFL.
This game is ruled by really smart creative guys that develop systems and schemes to gain an advantage. It has for been decades.
Especially today when excessive alpha male physicality and intimidation gets you a 15 yard penalty.
It's also ruled by teams that can acquire technicians that can operate at the highest levels of consistency and accuracy.
Whether it's QB's that can throw pinpoint passes and dissect coverage's, or CB's that can play with disciplined techniques, angles and anticipation, or LBers that can make the right reads, or OL men that can execute the right blocks with the right technique.
Biting kneecaps and punching people in the mouth is tough guy talk. It's out of touch leader talk as well.
Work smarter not harder.