A few years ago, the Bulls would've thought that offer would be a low ball. But unfortunately now, he can't stay healthy, he's becoming expensive given his production, and he has no offensive game whatsoever. I honestly think the Bulls would make that move so they can save money to resign Butler, and they can simply slide Gasol to the center spot while starting Gibson.
However, would it be worth it to add his contact knowing that he may not be able to play 70+ games for us?