I think the number is retired as well. But here is something to think about. Schools handle retired numbers/jerseys differently. Indeed, we handle them differently between sports here.
It is possible that Sam Houston had retired jerseys.
The one thing that is interesting is that it can be a recruiting tool.
1) Some kids like to where a certain number.
2) Sometimes you can impress a kid by telling him that you want him to wear the same number as another good player.