We need a good enough 2 to where Karl isn't resorting to this Rondo/DC/Belli/Rudy small ball crap.
That's the bigger picture issue beyond Ben vs our SG options. Because Karl has little confidence in Ben, he's running out Rondo/DC for large chunks of the game, but because we lack shooting if going Rondo/DC/Rudy and WCS/Kosta as one of the bigs, he's then resorting to putting Belli out there with Rondo/DC. But we need Rudy out there, so what we end up with is a small ball unit with him at the 4 where while it can score, is giving up as much if not more on the glass and defensively.
When you have Kofa/Willie getting time on the court with Rondo, it puts a premium on our SG to hit shots or at least be respected. My guess is swapping Ben for Anderson still sees us resorting to too much small ball crap as it's not enough of an improvement.
Ben's defense isn't the issue, it's the lack of shooting and overall threat from him is forcing us to go small which hurts our front court defense, hence why Griffin killed us twice in a week. And while we could go with DC/Belli or Rondo/Belli more often, Karl apparently thinks DC and Rondo are too good to keep on the bench. Really, we need a PG/SG combo which is good enough that Rondo/DC aren't considered the better option, forcing us to go small.