Revan doesn't have the Star Forge, but he does have everything the Star Forge made. And something that I should have brought up in the Grievous vs. Revan battle was that a good portion of the capital ships produced by the Star Forge were Derriphan-class battleships that were used by Naga Sadow. These ships are not very good compared to what Xizor can bring. They are essentially useless here.
Ya..am not too sure of that either...but anyway..
Revan's forces were just some defected Republic forces along with Mandos right? Not too well versed with Revan's army. Though wait, if Revan can't have the Starforge then how does he have Starforge made battlecruisers? :P