The problem with having so many great and interchangeable defensive parts is the offense suffers tremendously as very few players are well rounded and good enough at both to be able to play with anyone. Tatum is obviously that and Brown is as well, though Brown being a poor creator really hampers the offense, especially when the J's are the only 2 even good all around offensive players. No one else checks all the boxes i.e. shooter, creator, handler, etc.
Smart and White really shouldn't play much together because then the offense is horrible as neither one is a good enough shooter to be truly effective. And frankly, while they are both good creators neither one is great at that.
So yeah, as I've said elsewhere, I think you have to trade Smart and upgrade that 3rd position with a much better offensive player. I'd prefer a big guy like Collins, but if you could get someone like Brogdon, I think he makes sense even though he is a bit older.