Point 1 - totally agree. There's ZERO reason to be wearing a T-Wolves jersey or Vikings jersey to a Sioux game. Ever.
Point 2 - totally agree again. I've never seen someone with a name on the back of a jersey but no number. Absolute foul.
Point 3 - numbers only are fine if they're era-specific and names on the back didn't exist then. But if you're buying a 2014 Sioux, er, UND jersey and are just going to put a number on it, in my humble opinion, it just looks like something's missing.