Amir and DD did not outrightly blame Bargnani, they said what was the truth in that if you want to be a good defensive team, you HAVE to have a good defensive Center. On offense, the floor general is the PG, but on defense, the floor general is ALWAYS either a big Centre or a big PF. Andrea hasn't done his job, I've seen several times where he's moved out of the way to give some guy a clear path or didn't jump for a rebound or didn't box out, didn't move in for the help defense. If we want to be a good team, we have to get a good centre, that's how it works.
If AB goes somewhere else and does good, then great for him. Personally, I feel like management and coaching should take a lot of the blame here, we're actually a pretty bad organization when it comes to dealing with players, and if we could just fix that, we could probably turn Andrea into a defensive player and keep him. But since we can't do that, we're just gonna have to do the next best thing, which is trade him.