The Spurs made it clear well before the the start of the 2023-24 season that Victor Wembanyama would start his career at power forward. It made plenty of since at the time (and, to an extent, still does): he needs time to build up his core strength, they have a starting-caliber center who can spread the floor and take the tougher assignments in Zach Collins, and playing forward would give Wemby mismatches and the freedom to roam around on both ends instead of tying him down to the post.
However, early as it is, it might be time to start rethinking if he shouldn’t be playing more center.