That's a good point. I'm trying to find more info on the number of ships produced by the Star Forge, but it should be noted that the Derriphans were enough to get Revan started.
That's what I mean. Based on this Revan could have between 3 and 300. 'More' is a very vague term.
Not that the number of Derriphans really matters as they are just cannon fodder. Really, a very small portion of Xizor's fleet (the one seen at Coruscant) could handle any number of Derriphans.