1) I still take issue with "seminal," as it implies that Masi launched those builders careers or formed their talents in some important way. Most of the folks you listed -- or that I originally listed -- were subcontractors, meaning they were already established as craftsmen and were approached about taking on some additional work. Their association with Masi had little to do with their own framebuilding concepts - they were given a template and asked to reproduce it (this I heard Moulton say himself). They didn't work at Carlsbad or with Confente. Confente himself was already a high-level craftsman when he came to California, and his influence was far greater after he set out on his own. That leaves Baylis - one guy. (If you want to stretch you could conceivably include Simonetti of Medici, and maybe Mike Howard, who's not exactly a household name). Cali Masis contribution to framebuilding in America was a good deal less than many people seem to think, except to put food on their tables for a period of time, for which I'm sure they were grateful.
2) I am also referring to American collectors. They generally will pay more for Italian Masis than Cali Masis (with a few exceptions, which is why I say "generally"). The idea that Cali Masis are more desirable to US collectors is an urban myth, IMO. (The real exception I've run across is folks who collect primarily bikes by US builders, who would like a Cali Masi for obvious reasons but may have little interest in an Italian one.)