Gonzalez says he’s 100 percent sure 2013 is his last year

Last year, Falcons tight end Tony Gonzalez consistently said that he was 95-percent certain that 2012 would be his final NFL season.  It wasn’t. Appearing today on PFT Live, Gonzalez said that he’s now 100-percent sure that 2013 will be his last year in football. Sure, he has a two-year contract.  But that was for…