He won't play meaningful minutes for either team. Unless his name is Jason Collins, it will be hard for him to have a worse PER.
Miami plays 7 guys. Maybe 8. LeBron sat out and they started Oden. He'll get PT in Miami, and he'd figure to be their starting SF next season when Battier retires. Maybe he's hurt beyond recovery that I don't know about. Who'd have thought DJ Augustin, who couldn't get PT in Toronto, would end up with a 16 PER for the Bulls. His PER with Toronto was 1.3. One point three.