Texans quarterback Matt Leinart, making his first start of the season in place of the injured Matt Schaub, hurt his throwing shoulder Sunday at Jacksonville. Leinart believes he broke his collarbone, but coach Gary Kubiak said initial X-rays were inconclusive. "There's a pretty strong possibility I probably won't be coming back this season," Leinart said. "It's pretty disappointing. It's tough to swallow, but we'll just move forward. Everything that's happened to me, this was a great opportunity. ... It's unfortunate, but I'm not going to give up. It's not my nature. I'll just keep moving forward and figure this thing out one step at a time."