I am much more of a defensive historian and front junkie than I am an offensive specialist, but all that said, if you’re like me and really want to know how the various defenses evolved, then you could do a lot worse than the first twelve pages of Homer Smith’s book. What Doctor Z did for the history of the 7 man line in professional football, Homer Smith does for both the 7 and 8 man line in both college and pro football in his first chapter.
The book is worth buying for the first chapter alone.
That said, as this is a playbook, the book is dominated by diagrams and concepts. It’s a very conceptual book. It’s heavy with categories and many lists of things to know and do. As an example, it has an appendix of pass techniques you can use to achieve separation. There are, by my count, 29 listed, in three broad categories.
He talks about things like simplifying reads, so that QBs have a binary decision tree instead of a five-six part list. That sounds to me like practical advice. He discusses kinds of pass defenses and how to recognize them. There are sections on time outs and time management, and when to go for 2 points. He talks about pass protection schemes, inside and outside runs, blocking schemes, and a lot of things I’ll never have the time to delve into.
But his excellent diagrams, often of defenses, are enough for someone like me to call this book a classic, and make me recall the various philosophy lectures I’ve heard, particularly on the Greek concept of arete. This, indeed, is an excellent book.