Eddie Hearn took to Twitter this Wednesday to dispute claims an offer to Deontay Wilder was less than the Joseph Parker fight.
Despite Parker gaining a 35% overall split of the proceedings for last month's unification bout, Hearn says the flat purse was less than £6.5m.
Hearn said: "Cut (£13m) in half and it's still too much," when replying to a social media post about purses, as the Matchroom boss continues negotiations in an attempt to take the first undisputed heavyweight unification in almost two decades to British soil.
An offer of $12.5m to Wilder (12.5% of a projected $100m for the fight) was leaked to the media earlier this week, although there's been nothing released on the current (£8.8m) deal to suggest the American would be entitled to any further split of the earnings.
Parker walked away with a tidy sum from the Joshua deal after backing off a 50-50 split, although Wilder may not be afforded the same grace unless he can upset the odds.
'The Bronze Bomber' would seemingly have to win against 'AJ' at Wembley in the summer, in order to unlock a mound of cash for a lucrative rematch in the United States.
Wilder would then be the A-side and effectively call the shots as Joshua heads to Las Vegas as the challenger.
As things stand, there's still a long way to go for contracts to be exchanged and Joshua still has a queue of fighters lining up to be next in the firing line.
Alexander Povetkin is mandatory with both the WBA and WBO and has been assured negotiations must begin this month.
Add to that, Hearn has promised world title shots to both Dillian Whyte and Jarrell Miller in recent weeks and Joshua has his hands full.
There's also battles with David Haye (should he beat Tony Bellew) and Tyson Fury (once he returns) to consider in the future as Joshua juggles holding the majority of championships and the obligations that come with that honor.
You only have to ask Wladimir Klitschko about what is means to your career to have four belts as the formidable Ukrainian was constantly fighting number one contenders pushed forward by the relevant governing bodies.
Should Wilder walk away or the WBA not approve the fight before Povetkin, Joshua would then be forced to begin clearing the way for new mandatories to be given their chance.