Part of the core - Devin Vassell
While I stand by my argument that Victor Wembanyama is the only Spurs player that can never truly be considered expendable, Devin Vassell is the only other player on the roster that would fall into the category of a core player at the current juncture.
Yes, Vassell could be moved for the right price in the future. But as of right now, he is the second-best player in San Antonio and is crucial to the team's success. Much of what the Spurs do rides on Vassell and his on-ball creation abilities.
Devin has done an excellent job this season of keeping pace with his breakout third season in 2022-23. He has had his moments of inconsistency, and certain aspects of his game like his shot selection can still be cleaned up. But overall, he would be by far the best player in the Spurs' locker room if Wemby did not exist.
That alone makes him a cornerstone for the team right now. Now, the NBA is a business and acquiring top-level talent often means parting ways with beloved home-grown talent like Vassell. Best believe that if the Spurs are presented with such an opportunity to put an All-NBA caliber player next to Victor, they will do so with swiftness.