It's true though? Vergo was the only man Smoker "feared" the way he spoke of his strength he knew it was not going to end well for him. Smoker didn't even speak this highly of Crocodile back in Alabasta, nor Ace. Vergo puts the fear of god in people, probably cause he doesn't show any signs of feeling pain. He's the Terminator. Even that Dragon on Punk Hazard oddly ran from Vergo's presence when a weaker dragon had no issues challenging Luffy and Zoro in a 2v1.