They could get rid of some of the number duplication on the uniforms by adding some zeros. 00, 01, 02, 03, 04, 05, 06, 07, 08, 09.
Currently there are over 20 double numbers. Of course, it not a big problem in camp because they have a blue team and a white team. Also there are no spectators. But when the season starts, there are often two 7s or 14s on the field at the same time especially on special teams. TV announcers often screw this up.
It's not a big deal. But it can be confusing. Just sayin.