I can kinda get this line of thinking in a way, but when I think about it reeeeealy hard (too hard) it doesn't hold up. Innova even describes the Ontario, San Marino and classic as being different molds altogether. The Rancho is the most current version, but it isn't THE Roc. It's one of several that have similar feels, but different characteristics. I know San Marino's are stock in Star and have been for some time, and I just got an Ontario with the factory F2 stamp and 2011 in the original stamp, so it can't be that old either. It's more correct to call these new Rocs RC3 than Roc3, IMO.
Anyway, as it's been said Dave described this as being the 3rd version of the Rancho mold, hence RC3. I believe that the original is version 1, all Ranchos regardless of plastic and the + mold to be version 2, then this one version 3. So, RC3 regardless of what's on the stamp. Confusion could arise from it being marked R on the bottom, the same as RC1's, if you will. If you looked at an original Rancho and a RC3 side by side, you couldn't tell them apart if the stamps were the same, or if they were blank. Same tooling, same markings, similar feel, but 2 different discs.
It doesn't really matter in the end though. If it's a good disc, then people will throw it. If not, it'll be as popular as a Lycan.