I'll go:
Why Memphis does this:
It's become clear this season that Desmond Bane is the ideal running mate to put next to Ja Morant for now and into the future. The Grizzlies have been on an incredible run this season, mostly without the presence of Dillon Brooks. Bogdan Bogdanovic provides them with an elite shooter with at least 2 more years on his deal that they can add to their team. They will also get a first round pick that they can use to continue adding young talent to their young core, or use as a trade chip in future deals. Also trading Culver frees up more minutes for their young wings like Ziaire Williams, DeAnthony Melton, and John Konchar, etc.
Why Atlanta does this:
Simply put, the Hawks need someone with a competitive fire that wants to compete on both ends of the floor. Dillon Brooks is that guy. Right now, Dillon is out with an ankle sprain, so we may not feel his impact immediately, but when he is healthy, he's a guy who's known as a disruptor and an irritant on defense, someone that can bring toughness into a locker room, and has also been known to be a really good teammate. Jarrett Culver is added to this deal in order to make the salaries work. You can now trot out a starting lineup when healthy of Trae, Brooks, Hunter, Collins, and Capela.
What are some deals you would make?