If Obama today showed his long form birth certificate, this does not make the case go away. He will still be charged with UA. I am not sure what his brother is talking about. Maybe he meant prior to his brother deciding not to go to Iraq/Afghanistan.
Because Lakin is a senior officer it is even more important to make an example of him. Guilty of missing movement and disobeying an order. Give him hard time and forfeiture of all pay and allowances.
Military court is not the place to solve political problems. We do not want the military to even appear to remove a President from office, which can only be done via impeachment or electoral defeat.