#1 He failed to step up when it really mattered
A hallmark of the greatest footballers in history has been their ability to rise up to the occasion when the chips are down by delivering emphatic personal performances to lift their team.
While Messi has innumerously put up such performances throughout the course of his career with his hat-trick against Ecuador proof of that, he failed to do so adequately enough last season.
He began the season with an ineffectual performance over both legs against Real Madrid in the Spanish Super Cup loss, and as stated earlier, failed to influence proceedings in Barcelona's quarter-final exit to AS Roma.
The World Cup is the grandest stage of any player's career, and while Messi didn't necessarily need an impact performance at the World Cup to cement his legendary standing, Argentina's long wait for a trophy and Messi's brilliance meant that it was to him that a whole nation of 44 million football crazy fans turned to deliver them.
However, Messi failed in his role as Argentine messiah, and his failure to step up to the plate for club and country when needed last season is a valid reason justifying his exemption from the award nominees.