Spot on mate, Sturm hasn't the style to beat GGG he hasn't the movement or speed, Sturm is a quality fighter but his style would suit GGG, it would be the hardest fight of GGG career and won't be a blowout IMO but in the end i'd go for GGG between 8- 10 by stoppage
theres only 2 men alive under 13 stone who would beat golovkin..one stays in vegas the other in wales