I would hope whoever does the investigation would reveal simply if this is true or not and if so to what extent (like is everything Madison said 100% true, is most of it, is a little, or none of it)

Keep it balanced. The investigation should only state what changes to the company are recommended as a result of the investigation. If staffing changes are recommended, then no statement of why. Further information is relevant only to the parties involved. Anything else can cause further problems.