That's true, but there are sith on both sides. Sidious and Vader could arange a meeting with the Revan and Malak on nuetral terms, and then learn the location. They would part ways giving Revan the impression that they would be allies move the Deathstar into orbit around Lehon, and suprise attack the Star Forge. Ah, isn't the way of the sith so great!
Search your feelings, you know it to be true
──── CHAMPIONS OF THE FORCE ────
The Best Damn Republic Guild