It has to be Tim Duncan if we’re only considering post-1992 players. Duncan could have played in 2008 or 2012 if he wanted, so he’s kind of in the same boat as Kareem and (more or less) Walton.
Kareem and Walton both famously declined to participate in the Olympics when they were each the best eligible American, so I’m not sure excluding them makes sense. Walton’s year didn’t win gold, so his refusal may have decided the outcome. The balls on Kareem, man.
Bill Russell and Jerry West did win gold, also.
No.
All-NBA appearances is generally a pretty clear gauge for elite careers, and you don’t want to see them water it down.
If you go to four teams, then the majority of All-Stars will make an All-NBA team in most years, which seems to go against the point of the award.
I agree with other people that 3 All-Defense teams makes more sense.