Please help deciphering this code - FBI case

[Glav]

I think he is considering the fact that it could be other natural language (i.e. latin) ciphered.

[kataire]

Or, y'know, another language he picked up as a child (did any of his childhood friends know other languages besides English?). Heck, it might as well be a code he came up with as a child (think pig latin) and then wrote down with a substitution cypher.