My gut says Lewis, though, getting one-shotted twice by C-tiers guys is the stain that'll never go away. Some used to rationalise those shots would do anyone. No they wouldn't. That discredits the truly iron-chinned.
Why would anyone need to use the Jab and Grab against Briggs and Grant both of whom had Glass Jaws? Same goes for spastic Golota who ‘froze’ in big fights. Mercer is the only one who had a Chin and even Wlad didn’t use the Jab and Grab with him. What point were you trying to make?