Cooper Flagg is officially the third Rookie of the Year winner in Dallas Mavericks history. The award was announced on Monday night, ending months of debate between him and Charlotte Hornets rookie Kon Knueppel, who also had a historic season. It doesn't seem like that actually ended any of the debates, though. Talking heads around the NBA world continue to discuss whether the correct player won the award, if Kon Knueppel's poor performance in the Play-In Tournament made voters change their minds, and just how special Cooper Flagg is after winning the award. NBA Hall-of-Famer Paul Pierce made his case on "No Fouls Given", thinking that Flagg was the correct winner. ︀︀“I absolutely think they picked the right guy. Kon had a good stretch, you know, toward the middle after All-Star break, but I think Cooper at the end solidified his place as the best rookie," Pierce stated. "I mean, look at this. You’re first or second in all the major statistical categories amongst rookies.…