Rean and his team eventually left the sect three days later. Among them, many disciples of the Blacksmith and Formation Halls came with them using the sect's airship. They would spend a few days outside while setting up the antennas. Since they weren't planning to install them too far away from the sect, Rean would still be inside the 3000-kilometer range of their Soul Connection so that he and Roan could exchange elements. That would prevent the twins from holding Celis and Kentucky back.
On the other hand, Roan stayed in the sect. He was already quite busy teaching alchemy each day while still practicing his combat skills. After all, his role was always battle-related. While Rean focused on the Destiny Points, he would keep improving his and Rean's combat manuals.