What if NFL teams went back to power offenses like the late-80s Parcellsian Giants? Are running backs over 220 pounds more effective and less likely to get hurt? Can a running quarterback survive if he's deployed more like a running back? And why are there whole groups of people out there this obsessed with the past? Author Ted Kluck found, online, a community of computer nerds and football enthusiasts so rooted in the past and so uninterested in...