House, perhaps anyone who had a Gold BP for that flight was indeed a Premier? After all, SFO has a great deal of them, right? Just a possibility.

IMO, it would be a good idea to limit the Gold BPs to F, C, 1K, 1P, 2P, and *G only. That would make Priority boarding a lot easier. Y fare, B fare, M fare, *S, and whoever else has E+ seats should get Blue BPs, so they don't accidentally pre-board (and cause the gate reader agent a headache).