Cooper Flagg set to terrorize the entire NBA in 2026-27 according to insider workouts
The Rookie of the Year is preparing for his next evolution, and offseason workouts suggest Cooper Flagg could become one of the league’s biggest problems.
The Dallas Mavericks are less than a month away from tipping off their 2026-27 NBA season, a campaign generating massive expectations around Cooper Flagg . The reigning Rookie of the Year is looking to take the next leap in his development as a franchise cornerstone after being selected first overall in the 2025 Draft.
Flagg’s continued growth remains one of the most closely watched storylines in Dallas . NBA personal trainer Matt MacKenzie recently addressed the young star’s size and the impact it could have on his development.
“I haven’t put a measuring tape next to him, so I can’t confirm or deny if he’s grown in height. All I can say is he’s had one hell of an offseason. And no matter if he’s 6-9, 6-10 or 6-11, he’s going to be a problem,” MacKenzie said, according to NBA insider Marc Stein on X (formerly Twitter).
Flagg’s combination of size, athleticism, and rare mobility for a player of his height was a major reason he emerged as one of the most highly touted prospects in recent years . If he truly added inches over the summer, his physical presence could make him even more disruptive at the NBA level.
The next major step in his evolution will be developing a more consistent outside shot—one of the few areas where he struggled as a rookie. If he becomes a reliable three-point threat, defenses will have to respect him farther from the basket. That spacing would open driving lanes to the paint and enhance his effectiveness as an off-ball player, a key skill as he shares the court with Kyrie Irving .
The Mavericks officially open the new season on October 21 against the Houston Rockets , launching a campaign in which Flagg will aim to prove he is ready to become one of the league’s new faces.
