This is getting pointless. When you start using 'what if,' you dilute the argument.
'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.'
That isn't likely to happen, so it shouldn't be used as proof or have a part in this.