#3 AJ Styles
The thing that some fans often forget is that Dean Ambrose was the first WWE World Champion after the brand split made it exclusive to the blue brand. He defended the title at SummerSlam against Dolph Ziggler in a decent match.
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Then he lost the title to AJ Styles at Backlash and they feuded for a long time. Most fans remember this feud for all the James Ellsworth shenanigans. This could be a perfect opportunity to redo the rivalry that many were excited about.
The two could battle in a varying set of environments which is always a plus for Ambrose, a TLC match for the World Title could the main event the PPV of the same name which would be held in December of this year.