This is a big deal for Concealed Carry advocates. First, this is a major reversal. Second, Detroit's the type of city where lefties have long argued that more guns automatically means more problems. Craig's opinion on that changed after living in a state where residents could carry firearms to defend themselves.
What will likely come next is the kookification of Chief Craig. Other law enforcement administrators who have advocated concealed carry have been marginalized as kooks or hacks. I think that'll be a stretch this time, given his change of position on this.