The meeting with his vassals made him realize how bad he was at explaining. The first ten people didn't have many questions for him, but it was different for his vassals. They went into details, to the specific. Not just for the cultivation, but also for the Thousand Vows Pavilion's structure.
He was exhausted from how many questions he answered, but he was kinda satisfied with the meeting because it helped to shape the Thousand Vows Pavilion. One of the examples: he asked his vassals to send their people who were not in a leadership position in their factions.
Each vassal could only send three people max to join the Thousand Vows Pavilion. These first three people were candidates for the Grandmaster position. That was the reason he limited the number. Once the Thousand Vows Pavilion was formed, the pavilion would accept more disciples, and there was no limit for this one, as the Thousand Vows Pavilion was part of the Tang Academy.