Walker and Pierce couldnt get to the promise land together and neither will Tatum/Brown.
You can argue which player, Brown or Tatum, is better. Both have many pros and some cons. The issue is they are too similar and neither (esp. Tatum) is willing to sacrifice for the benefit of the team.
Eventually, one of them will be traded or leave. That will hopefully rebalance the team.
The team way too wing heavy. The team does not have an enforcer/menace under the rim (inlcudes punishing pick setter).
The team does not have a top end point guard.
IMO - Tatum's weaknesses are his handle and his finishing at the rim. Strengths, good outside shot and his ability to create or handle double teams is average at best. And his weaknesses have not significantly improved over the years. I see the same game from him over the past 3 years.
IMO- Brown has to step up more, I think he has the ability to take over games but does not. HE needs to stay healthy.
I see Brown as Pierce and Tatum as Walker, in the early stages in their career. Walker was hyped more, until he wasnt.