Those are the reactionary things he did. What did he do from June through November to teach and demand him to play hard? Mack doesn't have that naturally wired in him. Some players do, some don't.
Woody's failure was to not pick that up in his recruiting evaluations on him. I'm guessing he never digs that deeply with anyone. And Mack was a late flip, so he probably barely knew anything about him, other than how talented he was.
And then his next failure was not effectively teaching him how to play hard all the time...what it looks and feels like... and then once that feeling is there with Mack, expecting it and demanding it all the time.
I was a guy my high school coaches yelled at for being lazy defensively. I was too valuable offensively to not play, so they always gave me the easiest defensive matchup. When I got to college, I realized pretty quickly there was no hiding defensively in our program. And our coach spent significant time, in preseason workouts, conditioning, then when practices started, teaching basic core tenets of our defense. Shell drills, closeout drills, body position and footwork exercises, all of it. By my sophomore year I was guarding opposing teams best perimeter players, and for most of my college career I was an all defensive team level defender.
If I had played for a coach similar to what I suspect Woodson is, I would have been similar to Mack. (obviously relative to the competition level).
Coaches can teach players how to play hard, and how to defend.