Miller (extremely durable 300lb+ ultra heavyweight with middleweight conditioning), Hrgovic (skilled super heavyweight boogeyman), Joshua (2 time former unified champion), Parker (former world champion top 5 contender in any era), Usyk (the greatest heavyweight of all time) This could be the 2nd greatest resume ever behind Usyk
He'd need to defend his belt a few more times against legit contenders to be an ATG, after and if he beats Usyk after Parker. Would guess Usyk might want a rematch if Dubois beats him. Detractors might use Usyk's age but Usyk has just beaten Fury twice.