I'm not guessing at the probability. All I said is it doesn't necessarily mean he'd be injured. Perhaps he would, perhaps he wouldn't.
I mean he injured his hammy in training camp and didn't play a snap the rest of the way until the regular season at which point it was still questionable whether he'd even play the first game. A gimpy hamstring tends to be a lingering injury. Because of this the Bills went into the opener with an injured starter, a rookie who was pretty impressive and a special teams guy who you don't want to give the rock to very often.
This isn't retrospect, I said it before the opener. I didn't understood why they went into the season with only 3 backs on the roster given Shaddy's injury.