Many boxers have signature punches, but some use a particular punch as a crutch. Some names that come to me is Wilder and his straight right, Jeff Lacy and Tommy Morrison with the left hook. Devin Haney jab does everything for him same with Winky Wright.
Frazier is the first that comes to mind but boy oh boy did he make it work even though they knew it was coming. Same with Holmes and his jab. I must admit I can watch that jab all day though.
Yeah it sure wasn't a knock Rob. Greatest (overall) left hook ever. The Holmes jab was certainly heavily used, but he had a fine right cross and uppercut to back it up with.
Howard Winstone was overly reliant on his left, having lost 3 x fingers on his right hand. Though, tbf, he could jab to the head and hook to the body with his left with near equal aplomb.