It was the last fight of his career, about a decade past his prime, and 25-30 pounds above his best weight. So yes, he was shot.
He had one more fight, the 3rd fight with McCallum. BOOORRRIIINNNGGG. If he'd gotten the big fights he'd wanted at junior middle...I think he beats Duran, loses to Tommy, loses to Hagler at 160, and with Leonard? Leonard was so inactive, it's hard to call.