It's because of their names and fans wanted to see which one will be on top. And they guarded each one, there were highlights that Flagg was backing down on Bronny for a iso play and Bronny playing tough with his defense and then he was called for a foul. After that, Cooper got the ball again but he immediately goes for a turn around and make it. They are also talking during the game, not sure if there is trash talking between the two but obviously there is some communication and most likely the fans see this and so they make this comparison. Nevertheless, if we see the highlights of the game, it's more on Cooper had a dunk and overall had the better game between the two. At least the Mavs fans are over with Nico decision to trade Luka. Now, they have a exciting recruit and if he lives up to his name, he could be the Rookie of the Year and then help Dallas maybe into a good spot next season.