I think this thread and the premise of it is going to age very poorly and look quite comical in time. Let's look at some facts:
1. The team only made Tatum and Brown the main keys of the offensive engine last year, when they were 23 and 24 years old respectively.
2. The team and the Jays, last year, were severely affected by a very fast turnaround from the previous season, the condensed schedule, almost no practices, games missed due to Covid protocols, actually getting Covid(Tatum admitting he wasn't right for months and on an inhaler), injuries(Brown playing through pain and then getting shut down to get surgery on his wrist), a burnt out coach and many players that tuned the coach out.
3. Due to their age and newness of their roles there was always going to be growing pains as they adjust.
4. They now have to deal with a new coach and hopefully, though the jury is still out on this, a new offensive system.
5. This year is way too young and the sample size to small to come out of it with any meaningful conclusions. This is especially true given: Brown has had only one or two practices with the team in 3 weeks and played in only two of the three games, while Tatum has struggled with his shot in two of the three games, Udoka is still playing with rotations and 5 man groupings, and rotation players Horford, Richardson and Langford have all missed games along with Brown.
I think we, as the very demanding and impatient fan base need to give this time. Brown's playmaking looked great in game one. Tatum's playmaking looked great the last 5-6 weeks of last year. If Udoka can blend their talents together more when they share the court and the team can stay healthy for a good period of time to learn their roles once Udoka smoothes out his rotation and 5 man groupings, I think this idea that the Jays can't function together so the team can reach their true potential is going to look farcical.