In Landry's glory years, smash-mouth football did him well.
Then he got into the finesse years, the flex, blah-blah-blah. He quickly learned that fundamental, tough defense (not reacting to what the opposing team serves us, thus wagging the dog) wins games, not defensive witchcraft or high powered schemes with voluminous playbook (like Ryan brought with him).
When the opposing team passes, knock down the ball or hit the QB and/or the receiver hard. When the opposing team runs, stop it there. Simple. Fundamental. Things that never go out of style.
I want smash-mouth football like Jimma had, not the intellectual schemes that Ryan's not-so-intelligent players could not learn quickly enough.
"We are not descended from fearful men."
~Edward R. Murrow