What are some examples of physically weak fighters who were big punchers?

I didn't think of those instances when I posted, but I do remember them now. He did exhibit surprising strength there, but overall I'd say Frazier was more powerful than strong. He had a suddenness about his hook that lent a great deal to its devastating effect.

I'm not sure how Robinson might have fared in a wrestling match, but I'm dead-certain Tommy wouldn't have fared any better. Far from it! His height would totally play against him and he would find himself constantly driven to the mat.