I don't know if it would have mattered at the end of the day, but CS should have been more ferocious and trying to bully dude backwards. He was fighting at too much of a control pace. He needed be much more ferocious with the bullying and smothering. GGG had the skill to counter that, but GGG was seemingly willing to let dude fight that way.
That knockdown made him think twice. You can tell he was feeling that power throughout the fight after that.