To find the true measure of what Peyton Manning meant to football, don't bother poring over the highlights from his record 186 wins, or re-watching either of his Super Bowl victories, or looking at a single throw he made on his way to a record-setting 71,940 passing yards over 18 seasons.
Instead, simply wait 'til September. When it comes, pick any weekend, turn on any game — pro, college, high school — and watch quarterbacks lining up in the shotgun, changing plays at the line of scrimmage, dissecting defenses at will and rolling up numbers that were once deemed unthinkable.