Shane McGuigan is building up a decent stable and I think he probably decided that he couldn't make Haye the sole focus of his attention, which is probably what Haye would like. Going over to Miami and sipping cocktails (albeit alcohol free) in a hot tub on a boat with a punchbag probably isn't the way Shane wants to work. He probably also advised Haye to call it a day because of the Achilles injury , so it was pretty untenable.