I sparred with him
Back in the seventies I sparred with him in NYC. He had a wicked left hook and crunching short right to the head. Watch him give Ron Lyle a boxing lesson, demolish Mac Foster and Earnie Shavers on YouTube. George Foreman admitted he ducked Jerry. His manager Dick Saddler said "on a given night, Jerry could have given George trouble". Jerry may well have been the best man never to win the heavyweight championship.