You're right - I had completely forgotten that Provodnikov had fought Matthysse. I'm changing my vote to Ruslan!:deal
Lemieux landed quite a few hits on GGG actually. rewatch it. Also by Eubank jr. you actually mean Jacobs right?
Golovkin has had 300+ fights in the amateurs and 34 fights as a pro, supposedly has never been down yet. Fair to say his chin solidness should be pretty much proven by now.
I think hes overrated. Molina had been stopped very early by Arreola. Stiverne had been stopped before. Szpilka took tons of big rights from him. Is he a bigger puncher than Wladimir Klitschko?
James Toney until he officially announces his retirement. But I'm guessing you're refering to fighters who aren't completely shot to pieces.