The wishbone and the Wing-T were playbooks, Bill Walsh’s West Coast offense a meticulous method of gameplanning, but the Air Raid is something more akin to an idea, or at least several related ones: The idea that that to be get an advantage at modern football you need to be particularly good at something, and to be good at something you have to commit to that something, and if you’re going to commit to something it might as well be different.