Tony Gonzalez says that he's 95 percent sure the upcoming season will be his last, but he wasn't ready to completely rule out a return in 2013. "I've had a great run," the tight end said. "I don't want to be one of those players toward the end of their careers -- and nothing against guys that have done it like that in the past -- but I want to make sure that I'm at the top of my game when I do go out."