Toronto Raptors president Masai Ujiri said Monday night that while his relationship with former coach Dwane Casey has significantly improved but there is “still plenty of work to be done” for him to get to the same place with former franchise icon DeMar DeRozan after he fired Casey and traded DeRozan for Kawhi Leonard two years ago. “It’s not easy,” Ujiri said of making such decisions in an interview with TNT’s Ernie Johnson that aired on the NBA’s Twitter account. “If you have that human part of you, you feel it in your heart.”