The one thing I noticed that really stood out to me about Steele's defense is that yes it is an aggressive and downhill defense that allows it's playmakers to make plays but it differs significantly from the Diaz defense in that it focuses on pressuring the ball and not necessarily the QB/backfield.
Manny's defense was based on creating chaos at the LOS with heavy stunting, angle pressure and gap shooting. There was no thought given to any type of fundamental gap integrity. Steele's defense is based on solid fundamentals, gap integrity and physicality while playing aggressively downhill, and pressuring the football. Diaz would constantly send blitzes and pressures but if the QB got the ball off or had any time the d would get shredded. Diaz's pressures and blitzes were always geared toward the QB or the backfield in order to pick up cheap sacks and TFLs but misdirection made us look silly. Steele's scheme on the other hand is much more intelligent in that it seems to be based on quickly diagnosing where the ball is going then pressuring/collapsing on that area. There is emphasis on keeping things in front but it is not passive in that regard. It's quite the opposite actually. Steele doesn't give huge cushions generally speaking. Man or zone this is a defense that will use speed and explosiveness to swarm to the football/point of attack in a physical and aggressive manner. This is just a thought I had but Steele's scheme/philosophy reminds me of Carl Torbush and those aggressive defenses he had at UNC in the 90's.