The best coaches I've seen is they take the talent they can get, build an offense/defense based on their players strengths, and scheme to minimize their weaknesses.
D'No takes players, forces them to play a defense they are not suited to play, and schemes to accentuate their weaknesses.
It's literally trying to put a round peg in square hole; only the round peg is on fire, and is twice as large as the square hole.
Guys can say what they want about Shannon; his defenses lended themselves to the type of guys we could get.
When D'No was interviewing for this job, didn't he say his players were going to "GET TO THE QUARTERBACK AND MAKE BIG PLAYS?"
Add him being a liar onto the list as well.