This is the only thing that makes sense. I haven't seen any other Al'Quieda operatives pursuing martyrdom in a jihad against modular office furniture.
He obviously wasn't coached and coordinated enough to pull it off on his own on any grand scale - it was more of a symbolic action. He's was a 15 year old with a malleable mind. I agree with poster who thinks he crossed paths with Florida cell members through flight school connections. There was a report out today about NJ teen whose name appeared on a list in Kabul.