Sometime after that conversation, instead of developing new upgrades for the communication system, Rean decided to focus on what already worked, even if it wasn't perfect. That was a decision he and Havek reached, planning to first create a connection between each other. Once they could talk through the communication system, they could discuss what they could improve on with the other Formation Masters.
With that said, many Formation Masters on both sides were first taught how to build routers and antennas. As for the main ones like Rawor, they were taught about the DPUs and the core of the communication system. Considering the size that it would span now, it would be idiotic to work on it with only Rean and the few Formation Masters of the sect like Klaus.