4. Hamidou Diallo
It's obvious that the Mavericks still need defensive help.
Even after signing Grant Williams, Dallas still needs to add wing defenders that can come off the bench and guard multiple positions. They tried to do that by signing Matisse Thybulle, but as you probably know, Portland matched the offer sheet.
A great Thybulle alternative that is also two years younger is Hamidou Diallo.
Diallo played for the Pistons last season and averaged 9.3 points, 3.5 rebounds, and 0.9 steals per game in just 17.8 minutes per game. He was a solid bench piece for the Pistons and would be the perfect fit in Dallas.
Diallo is 6-foot-5 and has a 6-foot-11 wingspan. He would be able to be the first wing off the bench for Dallas next season and play serious minutes if needed.
Diallo is a lockdown perimeter defender and could help the Mavs hide some of their guards that can't defend as well, such as Seth Curry and Jaden Hardy. He has active hands and flies through passing lanes. Diallo is also a freak athlete and makes crazy plays.
Offensively, Diallo is a good off-ball cutter and finisher in transition. He throws down crazy dunks often and would give the Mavericks more youth and athleticism.
Signing Diallo is also a good option for the Mavs if they decide to trade Josh Green this offseason. He isn't as good with the ball in his hands as Green is, but he is arguably a better defender. Losing Green wouldn't be easy, but a player like Diallo could help fill that hole in the roster.