If it happened when it could have happened, back in 2012, then I would give Pirog every chance. He would have been the best boxer GGG ever faced. GGG doesn't like guys who can switch stance and he pulls back straight, like Tszyu used to.
Didn't Pirog have a bum back by 2012? To have a chance, it would have to be the version of Pirog who beat Jacobs.
I think he popped his back when he SPARKED Ward and Kovalev in training on the same day. His neck. His back and his neck. Spinal. Broken.