If true then still irrelevant to the charges Lakin is facing. He's being court martialed for missing movement and refusing to obey the orders of his brigade commander and not with refusing to obey Obama's orders.
Does his brigade commander have the authority to deploy additional forces to Afghanistan in support of OEF, as Lakin’s orders directly stated he was to do (starting by moving to the base from which he would be sent), without a valid order by the CIC?
While I was in the Army, I had to memorize and be able to recite the whole chain of command. It included the Secretary of the Army, all the way to the President.
The purpose was to be able to explain the authority of each in the chain. The President gets his authority from the Constitution and delegates it to each down the chain.
If the chain is broken there is no authority that can be exercised.