Yeah, that's why I said it doesn't disprove the theory, it was a side note. Still, there was one royal Red Rock and Melchior made 3 stuff out of it: the Mammon Machine, the Pendant, the Red Knife. So if something applies to 2 out of the 3 items...
Anyway, yeah the Mammon Machine has a slightly different purpose than the other 2 items, so this may account for the difference.