Since the 1960s, Arum has been in the business for more than seven decades.
He has collaborated with some of the greatest athletes in sports history, such boxer Floyd Mayweather and Manny Pacquiao.
And Arum has somewhat of a specialty in heavyweight boxing, doing business with Muhammad Ali, Mike Tyson, George Foreman and current champion Tyson Fury.
But it is the frightening undisputed bantamweight champion Naoya Inoue – nicknamed The Monster – whose punch packs the most power.
And Arum claimed only 19 stone Fury, 34, can handle Inoue’s power due to their 11 STONE weight difference.
He told GiveMeSport: “The only guy who might be able to handle Inoue is Tyson Fury because he’s a little too big for him.
“But this Inoue, I mean he’s scary. He is like a loaded rifle. I get such a kick out of this guy.
“You really begin to feel sorry for his opponent halfway through his fights.”
Inoue, 29, is a three-weight champion, rated among many as one of the best in the world, with 21 knockouts in his 24 consecutive wins.
He recently stopped Britain’s Paul Butler, 34, to reign as undisputed champion with all four belts in the 8st division.
Arum added: “I’ve never seen anybody with the concussive power, pound-for-pound, that Inoue has.
“I mean, never, particularly at that weight. He sets the guy up and boom he knocks them out the guy can’t move. He is really something special.”