Specifically against Dirk in that series, I'm not sure that a broom would not have done better than Bonner. My comment had little to do with Ian, but more specifically that McDyess should be credited with doing as good a job with Dirk as anybody can do in this league.
I hope Ian does well wherever he goes. I believe the Spurs saw in Blair a kid with more potential and skill and they already were thinking about Splitter, so I can see why they would let him walk. To me, that doesn't necessarily mean Ian is a scrub. I also agree he didn't get the same chances as Hill or Blair, who were handed rotation minutes right off the bat, even when Hill was pretty shaky in his new role as a PG and a fairly terrible summer league shooting wise.