Holding a personal mini-training camp before the official start of the team's pre-season training camp has a benefit: it can quickly foster closer bonds with teammates.
It's somewhat like the time when Jordan returned from his baseball hiatus and was defeated by the Magic in the playoffs, afterwards initiating the "Breakfast Club".
Although Jordan's relationship with his teammates may not have improved, increased contact certainly enhanced their understanding of each other, especially since he had been away from the Bulls for a season and a half.
Yu Fei, however, was different. He did not need to reconnect with his teammates through training camp because he had left the team. Jokić joined voluntarily, and their relationship evolved from mere colleagues to pure friendship.
Jokić's rapid improvement surprised Yu Fei.
Last season, although Jokić showed plenty of promise, he still retained much of a rookie's rawness in many respects.
Now, the situation is completely different.