He was acquired to be the back-up PF but then the opportunity to get Scola appeared. That meant that he was demoted to 3rd string PF who normally only gets garbage minutes. Vogel even tried to get him minutes by playing him out of position at SF but that wasn't good defensively.
If his contract plays any role in our ability to sign Lance then he will be traded. It's as simple as that. His contract is easily tradeable and Bird will re-sign Lance.