Will GGG retire having never fought real opposition?

Stevens was Ring #9 before the fight... and you don't think Proksa was legit after destroying Sylvester the way he did? In my book, he's fought 3 contender level guys.

As for fighting the rest of the top 5 at 160, Barker is not likely, Quillin is even less likely, and we'll have to wait until late 2014 until he -maybe- gets his hands on the lineal title vs Martinez.

There are chances he faces Murray and Martinez at 160, I think those are his main options for 2014. I doubt HBO gives Froch enough money to come fight Golovkin in the US. He'd want the fight in England.