All this hoopla over Sgt Bergdahl boils down, essentially, to this, IMHO:
Article II, Section 2 of the Constitution.
“The President shall be commander in chief of the Army and Navy of the United States, and of the militia of the several states, when called into the actual service of the United States; he may require the opinion, in writing, of the principal officer in each of the executive departments, upon any subject relating to the duties of their respective offices, and he shall have power to grant reprieves and pardons for offenses against the United States, except in cases of impeachment.”
Now, if you ask me, the Constitution clearly states that as CiC, Pres Obama has the authority to arrange an exchange of prisoners as well as granting a reprieve or a pardon for any offenses which Sgt Bergdahl might have committed.
So everything else is purely political.
Am I being too literal here?