He did get up at 9, but if you've watched a moderate amount of fights you know that doing that is quite risky. If you choose to leave yourself only one second to get up, there's always the chance that the referee will count you out. Getting up at 8 would be the safer option. (Especially if you're fighting away from home.)
If the fight had not been stopped, Chisora would have knocked Scott out anyway. Scott was not able to think clearly, brain was fuzzy.............