Not to harp on it, but you are missing the point with regards to Kaman IMO.
Of course the Spurs could use a PF who can defend and hit mid-range shots, but they don't have a lot to offer. In a bubble, what you say would be great. The reality is that they can't be that picky and long-story short, getting a semi-competent big man in Kaman that simultaneously allows you to dump RJ and get a large expiring? That is too much to pass up. It's likely that the Spurs don't have enough to even get Kaman, so it's all probably moot, but to argue about Kaman's talent is pretty strange to me since even with his limitations he's better than Bonner/Blair and if the Spurs got him it likely means RJ is gone so it's an incredible win IMO.