Since the US didn’t start sending pros until 1992 it wouldn’t be fair to include players who weren’t eligible. So for the sake of argument let’s say they had to be 30 years old or younger at 1992. So players like Kareem/Wilt/Bill Russell/Jerry West/Elgin Baylor/Bill Walton aren’t applicable.
With those parameters who is the best American player without a gold medal?
It’s always been Kareem, considering he’s a goat candidate and Steph never has been.
The OP explicitly excludes older players who had only a random chance that they’d be able to participate in an Olympics during their time.
Steph better