Was "The Duke" one of the greatest offensive weapons in boxing history?

[Mysterio]

For what he lacked in chin and defense, cottamn this cat could bang. Glass Cannon.

 

[wilddeuces]

Great left hook. Solid boxer, but I think fame got to him and eroded him a bit. Not saying he would have been top of the heap, but maybe a bit better than what he showed.

 

[Barge]

Aw man seeing him let that guy live when he was stuck in the ropes made me feel bad about what Mercer did to him.

 

[Brock-B-level-Athlete]

so this guy was/is a real boxer? i didnt know that