Always find these pieces interesting and insightful:
http://puntjohnpunt.com/2018/08/07/offensive-explosiveness-rushing/
http://puntjohnpunt.com/2018/08/08/offensive-efficiency-rushing/
http://puntjohnpunt.com/2018/08/07/offensive-explosiveness-rushing/
http://puntjohnpunt.com/2018/08/08/offensive-efficiency-rushing/