Something about RG3 and the way he ran, plus the lanky frame, I always cringed watching him, even in college. He looked like an injury waiting to happen. Ofc it only takes one hit, or a horse collar, and it can happen to anyone. So Jackson is putting himself at risk. But he is fast, agile, and sees the field well. Vick had a small frame, and his broken leg occurred in the pocket IIRC. I think Jackson, Watson and Wilson are a bit different with their body types, skill sets, and awareness. Many injuries are non contact. Speaking of Watson, he tore his ACL in practice, in his rookie season I think? He had a similar injury in college. Knees and ankles put a lot of guys on the shelf and are not the result of taking hits in the open field.