The only way this is possible I think is if we wait until next summer, and we offer some combination of Brown/Tatum (just one), Rozier (S&T), Kings Pick (hopefully it's high, which makes the cap hold higher) and then probably some small salary filler (but not another max-guy of ours). OR Brown + Smart + Kings Pick + Filler.
But otherwise, we'd have to deal one of Hayward/Horford straight up to make it work in terms of salary-matching. Trading away one our 2 biggest (and only) big-name FA signings in FRANCHISE HISTORY would be a bad look. Hayward especially after just 1 season and another filled with a tough rehab. Horford too though as we took him out of a pretty good situation in ATL (Likewise, Hayward with Utah).
Love AD, but I don't think it can or should happen. I just hope he either stays a Pelican for life or maybe goes to a team like Chicago (his hometown). Just PLEASE NOT the Lakers!
If we do need some salary to make a trade though, then Smart's contract extension could actually come in handy there (I think it's about 12M in trade value by next summer, about or very close to 1/2 what AD makes)