Honestly I don't think anymore points can be brought up, anything you post, you could probably find if you look a few pages back. I can say with great certainty that sickly Nagato with the 6 paths murder itachi, only thing he could do is use KA, but as it was stated, that is pretty much an instant win so I don't consider it valid.
Nagato and Itachi one on one is too difficult to predict, we've not seen nagato fighting 100%, although I believe that with the nine dragon sealing tech, that Nagato could quickly end the fight, I doubt there is anything else I could add to this discussion so I'm not posting anymore in this subject.