I've often wondered why former defensive players have not transitioned to coaching on offense, particularly with play calling.
As defensive players they know what is difficult to contend with, what has been successful etc. They know how defenses disguise and perhaps can take advantage of this.
Don Mathews was a defensive coach who became a great player caller but doesn't really fit the bill as he was an offensive lineman when he played ( in college)
Interesting that Houston's play caller was a defensive lineman in the NFL. The Texans were just average in this regard last night vs the Chiefs.