Haye is after the best money for the least danger. He weighs things up, and he would fight AJ , but it needs to be for big money. Because he knows after that, it's the end of the gravy train.
So if Hearn doesn't want him to fight AJ, he'd consider getting into bed with Warren, especially if it leads to a shot at Parker, which is undeniably winnable.
But Warren is no mug. He gets Haye on Board, Haye gets a title, he makes him ( through his mates at the WBO) defend against Hughie Fury, who he also promotes, and that becomes a win-win for Warren. If Hughie wins, he's used Haye to full capacity. If Haye wins, despite what Tyson Fury says, there's a massive money spinner between Haye and Tyson Fury.
So everybody wins, except in my opinion Boxing, because if all that happens, we still no fuck all about how good any of them actually are.