Luke Kuechly’s retirement may be surprising, but certainly not shocking considering he’s one of four recent star players that decided to walk away from the game at an early age. Kuechly joins Calvin Johnson, Patrick Willis and Rob Gronkowski as elite players who were on a Hall of fame trajectory when they decided to walk away. The MMQB’s Albert Breer tells Robin Lundberg why he believes the Pro Football Hall of Fame will have to consider players who walk away early in addition to the factors besides health that have led to more early retirements.