We never really know what the Spurs 'board' looks like. They may have had Cojo as BPA. I did, however, forget one factor, because they don't do it much any more, so I'll amend my statement: The Spurs don't draft for need, they draft the best player available, or a draft and stash type.
As for drafting guards three years in a row, it was widely accepted that Dejounte fell WAY farther than folks thought he would, and was BPA for that #29 spot. Didn't hear much about White, pre-draft, but you certainly could make a case that it wasn't for 'need', since they had just drafted a PG in Dejounte. LW IV, by accounts, was top 10 on the Spurs board, and they got him at #17. Again, BPA. You keep saying 'RC drafted'. It's not a solo endevor. PATFO sit down after the draft pool is finalized, and set up their board of 60 players. When their pick comes up, the work has already been done. They pick the highest available player left on their board, or, they pick a draft and stash. The'll know in advance, though, which way they will likely go. They drafted Mulinitov because they were clearing the financial decks for LaMarcus and needed every dollar.