I think you can just find somebody else to be the centerpiece, but this doesn't mean that you have to get rid of Andrea. As long as the team had a decent overall defence, in the past years, he was not so atrocius, but putting him in the focal point of your defence is not a clever move. A lot of player are not good defenders but in the right system they can at least do their job. Same goes for the opposite situation. I watched some of the last lakers matches and Bynum himself was not able to keep up the whole defence when teamates on the perimeter where constantly beaten.
But hey, I'm sure that this team w\o Bargs
is going to be a defencive force!