By Kirk Gilkey
Now that the 50th Super Bowl has come and gone, the banter on television and the radio airwaves will turn to Peyton Manning’s retirement and his ranking among the NFL’s greatest quarterbacks of all time. Where will NFL historians place Manning among todays best QBs like Brady, Rogers and Brees and the past great names like Elway, Montana and Unitas? Manning will surely be a first ballot Hall of Famer like Montana, Elway and Unitas five years after hanging up his cleats.