I was not going to get involved in this matter, but, USPSA rules are for everyone shooting USPSA, if this is a USPSA sanctioned match, the match should be shot under USPSA rules, end of story.
It does not matter if Dick Heini is a great contributor to the sport, great person etc ……
If Mr. Heini has philosophical reasons to ban the aforementioned holsters that were specifically allowed by USPSA rules, that is his prerogative, but under those circumstances USPSA should immediately withdraw from sanctioning this match. Call it the Single Stack National Championship, not USPSA Single Stack National Championship.
(Why not just get an equipment variance from the RD (Mike Voigt) under rule 3.3.1 and call it a "local rule" for the sake of this match? That way the match can peacefully go on without all this finger pointing.)
Nobody is finger pointing, just playing by the rules (USPSA rules)
Why do we need rules and regulations if the main body of the sport (USPSA) deviates from the rules?