You can find people from the time saying he had knockout power in his left hook and overhand right but he only has 13 KOs out of 37 wins. How highly do you rate Jack Sharkey’s power, if highly then how do you explain his low KO percentage?
Boxing fans talk allot about power but don't realise punch placement, timing and catching the opponent unaware are arguably bigger reasons for concussion
I would rate it as hurtful. He didn't have the power of a Max Schmeling, but his unpredictability and delivery made him dangerous.