4. Royce O'Neale
Royce O'Neale is someone whom the Dallas Mavericks showed interest in at the trade deadline, and he would have been a great fit in Dallas if they were able to orchestrate a deal for him.
This season, O'Neale is averaging 7.3 points, 4.5 rebounds, 2.8 assists, 0.7 steals, and 0.6 blocks per game while shooting 38.7 percent from the field and 36.7 percent from downtown. He is the definition of a true 3-and-D wing and would be a perfect fit in Dallas next to Luka Doncic and Kyrie Irving.
Although O'Neale is only 6-foot-4, his 6-foot-9 wingspan helps him tremendously on defense. He can guard up with no problem and effectively defend both guards and forwards. O'Neale would have been an interesting fit at the small forward spot on the Mavs, and his physicality and grit would have been great qualities for this Mavs team.
Due to Josh Green's play as of late, the Mavs don't really need O'Neale, but if the Mavs were aggressively pursuing him at the trade deadline they could consider signing him in free agency this summer.
O'Neale is someone who Dallas could end up seeing in the playoffs, considering that he is on the Phoenix Suns now, and he is now a part of the Mavs-Suns rivalry which has quickly become one of the best rivalries in the NBA.