"He was the only human to ever be punished and not be guilty."
Well, that's a little bit of an overstatement, don't you think? I'm no one special, and I have certainly been punished for things that I was not guilty of doing. In fact, I think that is a not uncommon occurrence. Power possessing beings often project their crimes onto, and punish, the innocent.
I can see how you may misinterpret that sentence. It's not that Jesus was innocent of one thing. He was innocent of EVERY thing. And He chose to be punished in our place. That is the difference. No other human that I am aware of has chosen that fate.