It has been this way for Brown and Tatum for basically 7 years. Every time I mention, but look at the last game and it is explained away and yet it is every single year.
Here are their on/off differential per 100 in the playoffs
2023 - JT +5.7, JB -7.1
2022 - JT +5.4, JB -1.5
2021 - JT -25.5, JB missed playoffs (5 game loss to Nets)
2020 - JT +4.9, JB -4.7
2019 - JT +3.8, JB -16.3 (this was the Irving year)
2018 - JT +12.9, JB -0.9 (JT rookie year)
It is only slightly different in the regular season. That is years and years of data. The team falls apart without Tatum on the floor even with someone as good a player as Brown. I mean most of their minutes are together, yet year after year this is what happens. It has been and continues to be a problem. And it isn't like Tatum is a prime Lebron type player. Even as a rookie it happened. On a team with Irving it happened. Teammates haven't mattered. Brown simply doesn't move the needle for this team. He isn't food enough to be a #1, even in limited minutes, and he doesn't give the team anything they don't get from Tatum who simply does everything better.