Layups: Speaking with David Schuster on WSCR-670 AM in what has become a Christmas Day tradition, executive vice president John Paxson tapped the brakes on Hoiberg’s latest positive update on Zach LaVine. While Paxson stressed nothing has gone wrong in LaVine’s rehab from left ACL surgery, he called the timeline for LaVine’s return “fluid” and reiterated his first game could be with the Gatorade League’s Windy City Bulls. Hoiberg had expressed optimism for LaVine’s return to NBA action in mid-January, which could still happen, but Paxson repeatedly said to “temper” expectations. … The Bulls took Monday off and will hold a closed walk-through Tuesday in Chicago before busing to Milwaukee.