Too Sharp, in a similar way Nunn did, had a tendancy to square up and fight when it wasn't wise. It's fun to watch, but here I think it gets him violently KOed.
This would have been a hellacious barnburner but I’ll also take Galaxy to stop Johnson as well. Like George Crowcroft said Johnson had the tendency to trade and let his hands go more often than necessary. He had the hand speed to outbox Galaxy but he didn’t have fast enough feet to completely avoid him and I see Johnson choosing to fight Galaxy up close until Galaxy lands the left hand bomb at some point in the fight.