By Andrew Holleran Colin Kaepernick hasn’t played in the National Football League since 2016, but the former San Francisco 49ers quarterback continues to push for a comeback. The former Nevada quarterback has been working out with some NFL wide receivers and quarterbacks this offseason. Kaepernick, 34, says he’s in the best shape of his life. A comeback still feels unlikely, though. Legendary NFL quarterback Warren Moon doesn’t see the league’s owners giving Kaepernick another shot. “I just don’t know if he’s going to get that opportunity,” Moon said. “I just don’t think the NFL wants that sub…