If I was Spurs I'd be tempted to trade for Trae Young with those picks. Similarly they might expect that Topić falls to 4, which is realistic. If that clicks it could be an amazing duo given a season or two. They might even go for Castle, he's trending up and has lots to like. Imagine they keep #8 too and draft someone like Buzelis (insane length lineup) or Cody Williams.
But yeah, everyone is looking at the 2025 draft. However, there are always unlikely winners in a draft, I do think a lot of it is luck. As I said before, I'm not sure there is a huge difference between 5 and 15 in this draft, there's a fair amount of recency bias that doesn't necessarily mean anything for the NBA.