Not sure how these letters can amount to anything significant from any perspective.
Of course you can’t court martial a guy who was in a unit as bad as Bergdahl claim’s his was. /s
Regardless of the letters, I’m confident a court-martial could be properly conducted.
But the motives behind the letters written while in “captivity” are seemingly dependent on the determined preceding motives that landed Bengdahl in “captivity.” I would think...
Of course, the regime will try to use any balloon that can hold its weight for more than a couple of days.