Every draft there are players that obviously know how to play but don’t have the athleticism and tools, just like this dude Williams here. Then there are guys who have the tools but not the skills like Nassir Little or Sekou. Teams usually go for the latter especially early in the draft.
However, every once in a while there’s a dude who, for whatever reason, is viewed as unathletic but has untapped or hidden potential there while knowing how to play - this is White. I also remember him being described as old and unathletic with limited potential. From what we know and can see as fans we have no reason to doubt these conclusions but thankfully the Spurs have more information and knowledge, so I’d be excited if they get a guy like that as they usually have development plans for these players and are good at it.