The San Antonio Spurs may already have the young talent required to build a serious contender, but one developing part of Stephon Castle’s game could determine just how dangerous this team becomes.
Castle enters the 2026-27 season with expectations rising rapidly. At just 21, the young guard has already shown flashes of becoming one of the most important players in San Antonio’s future. Now, his offseason development could unlock an entirely different version of the Spurs.
The franchise’s long-term foundation is obvious. Victor Wembanyama, Castle and Dylan Harper represent a potentially devastating young core that could define San Antonio basketball for years.
But in the immediate future, the equation is slightly different.
Wembanyama, Castle and De’Aaron Fox could form the trio responsible for pushing the Spurs into genuine contention.
And Castle may be the player who determines whether that combination reaches its full potential.
Castle is quietly solving one of San Antonio’s biggest problems
One of the most encouraging developments surrounding Castle has been his improvement as a perimeter shooter.
That may sound like a relatively small part of his game, but it could have enormous consequences for the Spurs.
Castle has already demonstrated that he can attack the basket with authority. His ability to get downhill, beat defenders and finish around the rim makes him extremely difficult to contain when he has space.
The problem is that opposing defenses have previously been able to give him room.
Teams could go underneath screens when Castle handled the ball or sag away from him when he was stationed on the perimeter. That allowed defenses to clog driving lanes and make life more difficult for San Antonio’s offense.
That could start changing.
Castle shot 35 percent from three on 4.3 attempts per game during the playoffs last season. While one postseason does not automatically prove that he has become a reliable shooter, the development is certainly encouraging.
If that improvement carries into the regular season, opposing teams may no longer have the luxury of ignoring him beyond the arc.
And that could completely alter how defenses approach the Spurs.
De’Aaron Fox could benefit massively
Castle’s development would not only help himself.
It could also make life easier for Fox.
Last season, Castle increasingly demonstrated that he could operate as a legitimate point guard. His passing ability and decision-making gave San Antonio another way to organize its offense, while Fox spent significant stretches playing more like a shooting guard.
If Castle becomes dangerous enough from three-point range to demand close attention, the Spurs gain another weapon.
Instead of forcing him to dominate every possession with the ball, San Antonio could move him around the floor, use him in off-ball actions and allow him to attack defenders who are already scrambling.
That creates problems.
A defender who closes out too aggressively could give Castle the opportunity to attack the basket. A defender who stays home could allow him to shoot. And if teams attempt to switch or trap, his passing ability gives San Antonio another outlet.
That versatility is precisely what could make Castle so difficult to game-plan against.
Wembanyama could become even more dangerous
The biggest beneficiary may ultimately be Wembanyama.
San Antonio worked hard last season to improve the spacing around its franchise centerpiece. Getting Wembanyama closer to the rim while surrounding him with players capable of knocking down open shots created opportunities that simply weren’t available when the floor was cramped.
Castle becoming a more dependable shooter would give the Spurs another way to maintain that spacing.
Imagine a possession where Wembanyama rolls toward the basket, Fox is positioned as another perimeter threat and Castle is capable of punishing a defender who leaves him open.
There are simply more decisions for the defense to make.
And every additional decision creates another opportunity for San Antonio to exploit a mistake.
The final ingredient in Castle’s development?
Castle already possesses many of the qualities expected from a future star.
He can create off the dribble, attack the rim, facilitate for teammates and defend with physicality. His passing development has been particularly important because it has allowed San Antonio to trust him with more responsibility.
But becoming a consistent three-point threat could connect everything.
It would force defenders to respect him further from the basket while simultaneously creating more room for his driving game.
That means Castle would no longer have to choose between being a ball-dominant creator and an off-ball weapon.
He could become both.
That is where the Spurs could become particularly dangerous.
San Antonio may have something special brewing
The Spurs are still a young team, and there is no guarantee Castle suddenly turns into an All-Star this season.
However, his trajectory is becoming increasingly difficult to ignore.
Wembanyama is already viewed as the centerpiece. Fox provides established offensive firepower and experience. Harper represents another major piece of the franchise’s future.
Castle sits directly in the middle of those timelines.
If his shooting continues to develop, San Antonio could suddenly have another player capable of attacking defenses in multiple ways.
And that may be the development that takes the Spurs from an exciting young team to one opponents genuinely do not want to face.
The next step for Castle is no longer simply about improving.
It could be about unlocking an entirely new level of the Spurs’ offense.
