No offense, but of course those 8 players aren't enough (at this writing, I'd argue only White, Poeltl, Vassell, could fill rotational roles on contenders). They're not even close to being close, nor are they to being able to be consolidated for a franchise player.
Getting a franchise player obviously isn't easy, but it is simple . . .
Post #262: Official San Antonio Spurs 2021 NBA Draft Discussion Thread - Page 11 (spurstalk.com)