We have a pretty large hole at PF
I would argue that Tatum is the best small-ball PF in the NBA (given that LeBron is mostly playing at SF this season). Really like Tatum at PF. He's more explosive than the vast majority of his opponents, which gives him a massive advantage on the offensive side of the ball.
Imo, we have a hole at SF. If we are trading with the Hawks, my target would be De'Andre Hunter. Problem is, why would the Hawks trade him? Well, they need to pair Trae with an elite defender in their backcourt. The C's have an elite guard defender in Smart. Assuming Tatum and Brown are off the table, I bet the Hawks would expect us to include Smart in the deal. I'm a big fan of Smart's game, but I'd be willing to consider that trade. The Hawks would have to throw in a filler as well.
Hunter reminds me of Mikal Bridges, only 2 inches taller and a bit longer. I reckon he'd be a terrific fit in our switch-heavy defensive system. He hits restricted free agency in 2023, hence he's basically under team control for 7-8 seasons.