I thought it was obvious he was using steroids when he lost so much muscle in just weeks after his last season in Miami. He started the next season in Cleveland quite thin, wasn't the same player, took a sabbatical mid season with a trip to Miami, then regained all the muscle by the end of the season and was back to playing like his usual self. I don't how losing so much muscle so fast and then regaining it just as fast during a basketball season could be done without steroids.