Trade & FA 2024-25:

[Kidnova]

Maybe because, given his druthers, Nico doesn't appear terribly interested in mediocre vets. If you're not a Hall-of-Famer who can still play (cf., Kyrie, Klay), it looks like he'd rather go with young guys with potential to grow throughout Luka's extended window.

There's also the fact that Spencer still wants to play significant minutes.  That's not likely an option here.