I found myself thinking, "not necessarily," many times during my initial reading.
Example: when describing man-free, Bill said (b/c the article is really by Bill Mountjoy--pornstar name if ever there was one) the corners will play outside leverage b/c they have "help" from the free safety. Some coaches play it this way, but most good coaches know that a corner in man can only expect help from a middle deep safety on a regular post route (i.e., not a "skinny" post). Since it is man coverage, the corner should align to take away the easiest throw, which is the slant or shallow cross. The corner will align inside.
There are many things that good coaches will do that make their coverages look like the ones Chris described but really be something else. Therefore, I have a problem with this b/c it implies if you learn his descriptions, you will be able to recognize coverages while the defense lines up. This is simply not true unless you are watching a high school JV team or a poorly coaches high school varsity team.