The story of the Mexican, Andy Ruiz inspired everyone, including Sylvester Stallone which produces a documentary series about the feat that the boxer got last June, when he obtained the heavyweight title after defeating Anthony Joshua by technical knockout.
Ruiz captured the WBO, WBA, IBF, IBO heavyweight titles back on June 1, when he dropped Joshua four times to secure a stoppage win in the seventh round at Madison Square Garden in New York City.
Fury will wrestle Braun Strowman in WWE in Saudi Arabia on October 31, while he waits for Deontay Wilder to defend his WBC crown against Luis Ortiz on November 23.
Ahead of the December rematch, Ruiz Jr stated: "I think being 10lbs lighter, I'm going to be a better fighter".
Hearn felt Ruiz actually looked bigger in the recent footage.
"I thought he looked quite tubby", Hearn said after watching a clip of Ruiz Jr's open workout in San Diego.
"I look for him to do it again", he told fighthype.com.'All he's gotta do is hit that mark and that's that chin, 'cos Joshua's been known to get tested and he's gonna go down. Make your own mind up.
"There was one picture of him leaning forward. Maybe he's done that".
Ruiz was driving his Lamborghini Urus supercar when he noticed an elderly driver having trouble with his Land Rover, which prompted the world heavyweight champion to get out of his $210,000 auto and offer his significant muscle as roadside assistance.
'If Deontay loses in November against Luis Ortiz, I would take the victor of AJ vs Ruiz Jr in February or March.' added Fury.
"There have been rumours he has lost weight", Tyson said.
"I don't like that". He did well at that weight, so he should stay at that weight.