I think Aaron would probably treat T'Challa well if he ever wrote the solo, unless his run had to suddenly pivot into making Shuri or Okoye the Black...
If what you want is a darker and threatening Superman than I think you should go with someone other than Conner. To me it feels tragic to push him in...
Don't get me wrong, I completely sympathize; I myself feel that way most of the time. But hey, it's a new year, not that horrible old one, and maybe...
Ah but you see, it's not as much WB/ATT/DC that would do it as much as a Taita Wai...oh, however you spell it, or a Gunn or whoever with a great deal...
In fairness, juggling all these characters has to be an impossible task. As much as I loved Giordano's tenure, he absolutely screwed over Roy Thomas...
Superman isn't a god for a very simple reason. He is accountable to the world. People can question and defy gods, but the gods don't have to justify...