Well GGG destroyed Geale who defeated Strum he also destroyed Murray who most people had beating Sturm the same with Macklin. Sturm was also KO'd by Javier Castillejo a guy who Oscar dominated. The one thing I agree on is that Oscar probably would've been crazy enough to fight GGG but he would've been stopped.
GGG would have done far better vs Hopkins than DLH did, he was completely out-classed and Hopkins was far too strong, GGG would walk right through DLH.