A couple of other things I want to add.

The fractured nature of the middleweight division hurts the fighters. Here's what I mean.

GGG will face Canelo, and at that point, if he wins, he holds all the belts.

Jacobs will face the winner of Lee/Saunders. If he wins, there is no debate that Jacobs and GGG are the best in the world, and they can't fight each other because of allegiances, even though it would be the best fight to make at 160.