I am not sure Cooney's power was ever the same after he tore his shoulder before the Holmes fight. Either way he wasn't the hardest puncher ever. He also has to get 'set' to throw his hook against a moving fighter like Holmes kept him from landing flush. He could hook under and over with accuracy which many fighters could not do. When was the last time we saw a Heavyweight KOing people with body shots as much as Cooney did?
It has been a while.