Justice is basically the embodiment at this point of French House (which Daft Punk basically started). Justice’s Cross album is iconic and is probably one of the best early 2000s electronic albums.
Skrillex is incredibly talented. Far more than the mid 2000s wub-wub dubstep he produced. He’s definitely the biggest name in production and his talent continues to expand. His recent work with Four tet shows an expansion of his sound beyond typical hard style, dubstep, and screamo/metal. He’s still judged a lot for his early break through work, but those albums were responsible for bringing EDM to the masses. For better or worse.
DeadMau5 is the biggest asshole in EDM and he loves that. I think his ability to identify when to use sounds and how to properly play with them could lend to a more musical approach to the next Tron. Where Skrillex would have ideas from four yet using delicate electronic ambiance, deadmau5 would focus on lengthy chords to carry a scene. Something that the DP Tron album definitely had. Lots of chords left just sort of openly playing as the backdrop during whole movie scenes.
I say all this as I suspect that Disney may want another electronic artist to really create that sound. These are the names I would throw out in a meeting, but there’s more interesting names out there like Four Tet, ATTLAS, or even an Odesza for something weirder.