i think it was more a respect issue for him.
detroit refused to pay him what he thought he deserved.
unfortunately, he (along with the majority of NBA players) have an ego issue and bloated sense of self worth.
he wanted 100 million! how dare detroit only offer 85! what a travisty of justice!
he thought the owners were being cheap, and didnt value him. so he felt unappreciated.
and chicago showed him money and love...