I'm a big Golovkin fan but... BJS will have beaten Lemieux, Eubank Jr, and Andy Lee. At the very least their resumes would be comparable.
This is a competitive and interesting fight and if Saunders gets the win, a good preparation fight before Golovkin. Classical styles make fights type of situation. IMO Saunders is better technically and his power is bit underestimated. On the other hand, Lemieux has great power and his boxing skills are underestimated by many. I have a feeling Lemieux takes this by KO but I wouldn´t bet on it.
GGG/Brook-September 10 Usyk/Glowacki-September 17 Cucknelo/Smith-September 17 BJS/Lemieux September 17 NICE.....