I don't know if anyone has mentioned this before, so forgive me if this is nothing new.
I'm starting to have doubts about Shikamaru's code breaking skills
and second thoughts about the code itself.
Shikamaru thinks the message is meant for Naruto and Kakashi tells them that the 'combination' needed to work out the code is Itcha Itcha Tactics, the answer they come up with seems to make sense, 'the real one isn't with them'.
But Jiraiya intended the message to go to the great toad sage and during his fight with pain he was thinking about his life, Naruto as the destined child and his first book, 'Ultimate Guts; A Ninja's Story'.
So are they using the right book?, Does the great toad sage read Itcha Itcha?, Could Shikamaru be
wrong? (gasp).
This theory fits in with Kishi's tendency to lead us up the garden path.
My hope is Naruto will come up with the real answer now he has read the book.
Feel free to throw rocks if you disagree.
Personally I love the idea that Konoha has been mislead because of Kakashi's obsession with porn.