This week Texans coach Gary Kubiak just cut to the chase. Jackson is out and Brice McCain will start in his place.
Jackson shared a little more about his injury with us Friday. He has a fracture to his first rib, the one that's right behind his collarbone. It limited his range of motion in his right shoulder for a while, but he said he's recovering that.
Given how painful a lot of daily tasks are with the injury, tackling would be nearly impossible, especially since the fracture is right about at the point of impact.