What if Sasuke is the spy working in Orochimaru's camp? That would explain why he left the Leaf village when he could of trained under anybody like Kakashi (who managed to activate the MS on his own). The only reason Team Shikamaru was sent after them was to trick Orochimaru into trusting Sasuke. Also, before the Sound 5 came toget Sasuke he was already getting ready to leave the village (which was right after he talked to Kakashi). Another thing is how did Tsunade know where to send the Gaara's team to when even Kakashi didnt know where they were at? Tell me what u think.