In my opinion The premise of the question is wrong. Instead of creating an "approved holster" list, which if memory serves, USPSA attempted and abandoned in the late seventies, and if I am correctly informed, IDPA has more recently abandoned, USPSA should instead create measurable, defined specifications for holsters to be used within the division. This way if a custom holster maker wants to make a holster, or a competitor wants to modify an existing holster, the holster itself will either meet specification or move the competitor into the appropriate division.
This also eliminates the ugly spectre of nepotisim in getting a holster approved. I am told IDPA recently had a situation wherein a holster manufactured for a distributor (which was also marketed under another name)was either approved or disapproved not for dimensional differences but solely on which stamp was rolled upon the holster.
Equipment rules in USPSA should be guidelines to determine the best equipment features for a particular shooter within the confines of the rules established.
