-To add a 10-second runoff with less than a minute remaining in either half when the sole reason for the clock stoppage is because of injury.
-To establish three seconds as the minimum amount of time required to be on the game clock in order to spike the ball to stop the clock. If one or two seconds remain on the clock, there is only time for the offense to run one more play.
-To require a player that changes numbers during the game to report this to the referee, who will announce it.
-To preclude multiple players from the same team from wearing the same uniform number (for example, two quarterbacks on the same team are not allowed to have the same number).
-To allow the use of electronic communication by the on-field officiating crew (the practice was used successfully on an experimental basis by the Southeastern Conference). This is a permissive rule and not a requirement.
-To allow instant replay to adjust the clock at the end of each quarter. Previously, this provision was in place only for the end of each half.
-To clarify uniform rules as follows: “Jerseys must have clearly visible, permanent Arabic numerals measuring at least 8 and 10 inches in height front and back, respectively, and be of one solid color that itself is clearly in distinct contrast with the color of the jersey, irrespective of any border around the number.” This rule goes into effect for Football Bowl Subdivision teams in 2013. Football Championship Subdivision, Division II and Division III teams will have until 2014 before the rule becomes effective.
I'm not sure in there where it says two guys can't share a number. The way I read it two guys that play the same position cannot have the same number. Most college football teams have over 100 players on their rosters. Ohio State just released an updated roster 2 days ago that's has plenty of guys sharing numbers. I think they meant 2 guys on the same side of the ball can't share a number. In some cases there are teams with a backup QB sharing a number with a walk-on WR. I noticed this when editing rosters. I might be wrong, but there are teams releasing spring rosters right now with a bunch of duplicate #'s.
http://www.ohiostatebuckeyes.com/spo...ootbl-mtt.html
An example of a change that would have to be made is #21, David Perkins switched to this number when Jamie Wood announced he was done playing football due to chronic injuries, Wood has since decided to give it one more go and has returned to the team. So I'm sure this will get changed.
Another example would be #88 Steve Miller is a solid scholarship DE, but they have two WR's wearing the number which won't fly. both of them are walk-ons and will be lucky to make the team would be my guess. I'm not trying to say you are wrong, but I think there are far too many players per team to not have duplicate #'s.