But despite all the hype going toward the Duke star, one former NBA champion isn't buying all the hype around Flagg. Former champion and Defensive Player of the Year Tony Allen doesn't see Flagg dominating in the NBA.

One of Boston's top defenders on its 2008 title team is questioning whether Flagg is a franchise player at the next level

The Dallas Mavericks are going into the offseason knowing they are going to select Cooper Flagg with the No. 1 overall pick. While Flagg is an exciting player for the Mavs, he doesn't check off all the boxes of the team's needs for the upcoming season.