Please stop.
You're just in denial.
Itachi was fighting nagato with the help of naruto and killer bee. If nagato and itachi were fighting head on, he would have lost badly.
He didn't get owned by totsuka. He was an edo under the control of nagato so he didn't have his senses + he was only focusing on capturing itachi and naruto because of the eight tails and nine tails. Totsuka isn't fast at all, he could have dodged it easily if he had control over his mind
Anyone who thinks itachi>nagato because of that battle is nothing but a pure fanboy and noob. It's garbage logic.