I think it is the Southern Section. People here go on and on about some supposed "Folsom rule", but really the SS has been trying to figure out its competitive equity thing for as long as the CCS has.
Once it was decided they would move Corona Centennial to their D-1, there was really no one left who would likely compete with that champion for an Open slot. The SDS Open winner is good, but they compete against SS D-2, not 1.
Does the SDS want its top team eliminated by the SS D-1 champ? No. Prior to Narbonne getting busted, the LACS didn't either. They were more than happy to vote for removal of the Open Regional. In the north, no one was yet touching DLS, so an Open Regional wasn't in the best interest of either the CCS or SJS.
When you really look at this as a whole, it's pretty easy to see why it passed 10-0. This is why it's stupid to call it the Folsom rule.