I wonder how many spots up the Spurs could move from 20 or 21 if they offer that pick + 23/24/25 and 38 picks. Up from 20 or 21 to 16 or 17?
What if they throw in Richardson to a team like the Cavs or Hornets who need perimeter defense + shooting. Maybe you can get to the Hornets 15, or the Cavs 14th pick. Richardson is a 37% career 3-pt shooter, has just come off a 42% 3FG season this year, above average defender. his 3 point % seems to go up when he's in a reduced role.
Cavs areas for improvement are at the 2-3 position (Allen, Mobley and Garland are their building blocks). Hornets need defense and shooting and a C. They also seem to be in win now mode. They'll likely take Duren or Williams with their 13th pick, they may be open to moving down from the 15th pick for an established player that fills an area of need.
The Spurs would obviously only do this if someone they really like is there at 14-17. That could be Dieng, that could be Branham, that could be Eason or even an Agbaji who would fill a 3-D need at the 3 position. To me there is a drop off after the top 9 picks to the 10-15 range. Then there is another drop off from the 10-15 group of prospects to the 16-25 group imo.