The draft is BPA. Free agency is not. The draft comes first and thus informs teams of what their free-agent needs are. Ultimately, the FO should be trying to put together a functional team that efficiently uses its talent to win games. That means not letting guys like Champ, Bran, Wes and the rest have rotation spots without challenge. If you try to take a BPA approach to free agency and overstock your roster with on position, you fail to bring in adequate compe ion and depth for the other positions. The team can end up without a viable starting SF and no real means of bringing one in and having Champ continue to start there. Blake and Malaki could end up as the bench guard rotation while Cissoko is cut because the Spurs decided to use two top-10 picks, their big junk of cap space and the RE all on front-court guys. To me, that would be a disservice to Wemby, Vassell and every other Spur trying to win games. The team has too many holes to triple-dip on a position.
The team doesn't need their picks to be stars or even starters right now, but they do need them to be real NBA players. In other words, the ability to contribute immediately while building toward their upside should be factored into the definition of BPA the team is using to make their picks.