I think Bam might be the biggest competitor. His defense might give him the edge over Domas especially if he finishes top 3-5 in DPOY voting.
I think it's Bam at 4 too, but I don't think his defense makes up for the massive delta in their offensive production. Bam isn't even close to Domas this year offensively or on the glass.
AD has a individual statistical case, but his team sucks and he's missed so many games this season that he shouldn't even be in the conversation.