At last month's news conference in London, Miller provoked Joshua as the pair exchanged insults, attempted to trash talk with Dubois who offered little back, and then later confronted Eddie Hearn.
Miller and Joshua continued their verbal dispute in Riyadh on Monday after bumping into each other during media commitments.
Hearn - who once said no credible promoter should ever work with the Brooklyn boxer again - appears to have softened his approach.
"We had our choice words at the news conference," he said. "I like Jarrell but it still doesn't sit right with me. I won't change my mind on that but if he's sorry and he's served his time how can you deny his opportunity?"
The Matchroom promoter also refuses to rule out Joshua-Miller in the future, adding: "Who knows in this crazy world of boxing?" - although whether Joshua would be willing to give Miller a payday is another matter.
Dubois too has plenty - potentially his career - at stake in Saudi after a crushing world-title loss to unified champion Oleksandr Usyk in August.
He was stopped in the ninth round by the Ukrainian, having floored Usyk in the fifth only for the referee to deem the punch a low blow.
"There is so much riding on this for Daniel. This is must-win." Warren says. "He could have won his last fight but something was just lacking at the end and he needs to address that, and this is the fight to do it.
"Whether it's self-belief or what, Daniel has to go out there and impose himself against Jarrell and get himself back to the big table. Otherwise he has a long road back."
Dubois - who has won 19 pro fights, 18 inside the distance - added: "I'm ready to go, let out all of that emotion that I've built up from the Usyk experience and turn it into a positive. Come through this big show with a win.
"I want to punch holes in Jarrell, whatever it takes to win, for me it's important to win in style and put all of that [Usyk loss] behind me."
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