Tyson Fury believes it would be "a sin" for the world's leading heavyweights not to fight each other to establish the undisputed champion.
The 30-year-old takes on WBC title-holder Deontay Wilder in Los Angeles on December 1 and is a marginal underdog with Sky Bet.
Whoever wins could get a shot at Britain's Anthony Joshua, who has the WBO, WBA and IBF belts, although the potential for a rematch should Wilder lose may complicate matters.
Fury was asked about the debate over who is the better fighter.
"I'm not sure. People will always have an opinion on who is better, it is not up to me," he said.
"But it would be a sin not to fight each other and all get in the mix. It is going to be an exciting time.
"Who is the best we will find out when we all fight each other."
First Fury, who is putting his 27-fight unblemished record on the line, must get past an American opponent who is 40-0 with 39 knockouts.
He believes beating Wilder in the United States would make victory even sweeter, having pulled off a similar feat three years ago when he beat Wladimir Klitschko in Germany to land his world title.
"I'm hoping it is going to be the biggest fight of my life, that's what I'm preparing for. If it is anything less it will be easy for me," said Fury, who will be in only his third comeback fight after vacating his WBO and WBA titles to focus on treatment for depression while also spending time out of the ring after testing positive for a banned steriod.
"I'm happy it is here. It gets me on the road again and I've become a road warrior.
"We could have had this at Old Trafford and sold 75,000 tickets. I think it doesn't really matter where the fight is going to be, the outcome is going to be the same.
"If you are good enough you win, if not you are going to lose. It makes it all the more sweeter when I win in someone else's backyard."
Fury has taken on Freddy Roach, who worked with eight-division world champion Manny Pacquiao for 20 years, to work in his corner alongside trainer Ben Davison.
Having completed altitude training at Big Bear Gym in California, Fury has now moved to Roach's Wild Card set up in Hollywood.
"He's given us good pointers. He can give us some good experience. Whatever Freddie wants to do he will do. He's his own man," added Fury.
"It is always good to have experience and a wise head in your corner and it will be to my advantage."