Now, I'm not saying for sure that Kakashi is/was the spy, but at this point I wouldnt put anything pass Kish, especially if it makes the story that more interesting.
If Kish somehow made Kakashi the ultimate traitor that he portrayed Itachi to once be would be pure EPIC. Kakashi reasoning the death of his father and having no one there are for him. He's shown no real emotion, so he would be the best person for it, fooling eveyone.
So how would you feel about Kakashi being the true spy of the series???
Do you think it's possible??
Possibly, but how could he be a spy? He was born and bred in Konoha; father being the white fang. You could be right though.
it would be the typical "inside man" story. His inner hatred emerged from his father's death after the village discredited him. Kakashi being so well known everywhere, he could be the only possible inside spy for the village. His character has shown no real purpose so i would love this to be the reason for it all.