It's possible the Jihad material may be incidental. Right now the only thing he seems to have in common with them is a sick fascination with homemade explosives and suicide.
Was thinking the same thing. Its very possible that this is just some really messed up kid, not someone influenced by Islamists. Jihad material could be like the new Anarchy cookbook - a good source to get "good" information on how to make bombs and other f'd up things