I really don't believe they will find anything that has not already reported. She called the police and gave them her version of what happened, SOP for the police is to err on the side of safety so they arrested him on "suspicion" of battery. In order to keep him detained they had to charge him with something or release him which is what they did. Once they became aware that there was video of the incident they procured it and once it was proven that he did not do anything wrong and her story was false, charges were dropped and she was charged. I believe the process worked as well as it could have under the circumstances. The accuser needs to be held responsible for her actions. which obviously had consequences and could have costed Bragg his career.
I am going to guess KU personnel was on top the entire time and knew it would not take long to get unraveled and wisely stayed out of it, lest be accused of interfering, and let the process take its course.