Dick Doleman
Your theory is, I hope, wide of the mark as regards the process. The BoI president works on behalf of the convening authority, and would not communicate directly with the Service police or the prosecuting authority. If a decision was taken to proceed to formal proceedings, the inquiry would have to be suspended pending the outcome of those proceedings; the president would have been instructed accordingly. Statements given to the BoI are not themselves directly admissible at CM, so the disciplinary investigation process would start from scratch.
Like you, I think it would have been better to await the completed deliberations of the BoI, and then make any decision on further proceedings in the light of the completed inquiry. A good deal of time and heartache, not to mention money, might have been saved.
Regards
Ginseng