Well first off, RB numbers can start at #20, and LB numbers end at 59 and can even wear a number in the 90's. Second off, teams don't get better by bettering their running backs or linebackers. If you have a good team already, which we do, then you wouldn't even think about trying to upgrade running back or linebacker. Now if you were talking offensive lineman, you would start with 50-79. Most offensive lineman wear 60-79, but there are a few outliers that go with the 50's. Defensive line is kind of random, you get some 50's, some 70's but mostly 90's. The whole idea, like i said is kind of ridiculous.