The only advantage I can think of in Criswell's plan to use the moon for solar power stations that makes it better than GEO solar power satelites is the stable platform and easy servicability the moon offers. Spacecraft inevitably wear out over time and fail. If a substantial portion of earth's power came from these spacecraft there could be big trouble just from entropy. So we launch new satelites all the time or we get a stable platform on the moon that allows for servicing from a nearby moon base. The same goes for the nulling interferometer. Stability requirements make the moon much better than a fleet of spacecraft and the nearby moon base allows for NEVER ENDING science because it can constantly be repaired or upgraded easily.