What are you trying to prove? GG is a puncher. Although Toney could hit, he was more of a boxer. My guess is that if GG had've had Toney's schedule where he was fighting every few months, then every once in a while, you'd have see B and C class guys hanging with him.
Are your posts serious, or are you just having some fun? The MW division wasn't a side note, and how the hell did James fight in a weak era?
I'd go with GGG by a close decision, McCallum gave Toney all he wanted and doesn't carry nearly the kick of Golovkin. Toney is not a mover so he'd be trying to counter after getting hit constantly and he'd end up taking the harder punches in the fight. Be a good one