If he has a guaranteed 350 million dollar contract, which breaks down to nearly 32 million a fight, there isn't an incentive to fight tougher opponents without a PPV option.
Even if GGG signs with DAZN the bar is at the PEDnelo contract and below so both fighters would make less than the rematch and the first bout. Why fight a third bout for the punishment both fighters took when you can fight a paper contender like a Fielding or somebody marginally better.
I have a feeling PEDnelo may drop a few belts to avoid a Charlo, Saunders or any boxer type. He may choose Lemieux in the spring if Lemieux and his camp feel he can make 160 without health issues like he had this weekend.