First of all, we have no idea if spurs actually wanted Salaun. That's collective self conviction. And if you ask me, whatever their intentions were, no one will regret they didn't get Salaun.
Second, I'm personnally happy spurs didn't add another two rookies to develop this year to the roster, specially an uncertain one in Dilly, but just picked a guy whose game have the most probabiltiy to translate to the NBA and become a valuable player. that also means, despite what Wright might say about the current roster that they want to keep room for vets and that we might see some trades this summer, maybe including the picks they just got.
I don't know if they plan to play Castle PG but also picking Dilly would have been another messy season and an unhappy Wemby in the making with an NBA back up PG (Tre) and two rookies, to play the point next year, including one who's not really one and the second who ca'nt defend.