Number one question still remains unanswered: if his story is true, screeners in Fayetteville looked in his bag, confiscated the smoke grenade and left 2 pounds of explosive.
I expect the spin on this will be that Fayetteville took the smoke grenade (possible detonator) and 'admonished' him. TSA will then point out that, as Mythbusters has shown, the explosive by itself, without a detonator, was not a threat and 'at no time was the travelling public at risk'.
Not that the same logic applies where cupcakes are concerned, of course...