One thing these moves do for me is cement the idea that the Spurs do not want a smallish PG, so all of the rumors surrounding Trae Young, Darius Garland, and any other guys of that ilk should be viewed with extreme skepticism. They passed on Dilly, passed on Devin Carter, tried to make Sochan a PG, hoped to make Primo a PG, stubbornly wouldn't start Tre Jones when he was the best option, etc., etc... If the idea is to experiment with Castle at PG, it only reinforces this idea of an obsession with a bigger PG, because in theory handing over the reins to a guy with no history of 3pt shooting success at all (as with Sochan also) shows that the size theory is first and foremost in their minds.