I was thinking about it the other day from Spurs perspective.
Splitter is useless outside of the paint, Duncan is no longer a good midrange shooter, does not shoot often from there and does not attempt 3p. Both are however very good passers.
So it might be more important for the offense to have a good passer at the 5 than a midrange thread.
Of the bigs in the list Okafor and KAT are very good passers but way out of our draft range. Porzingis as per Draftexpress has a bit of a tunnel vision.
I have no idea about WCS. If he can move the ball confidently on O, set good screens and roll hard, it should be enough.