Not getting knocked out early in their career but late on and the knockout has to be completely out. It's very very hard mentally to come back even to step foot in a boxing gym after a cold spark out knockout let alone fight at elite level and beat top fights
Duran is anther one. Hatton said once after the knockout loss to manny he was scared to enter a gym for months
Manny pacquiao is amazing. Knocked out early and become a bonafide superstar in the USA Knocked out so late after becoming fighter of the decade. A bit gun shy and more careful approach but still dominating welter weight, his highest weight class and eventually securing his mega payday with Money. Even know is 50-50 against current prime crops. I can't think of any past great that have this kind of comeback. The closest one is probably Duran after no mas and being sparked by hearns.