Completely drawing a blank lol unless they used another heroes villain, unfortunately most of T'Challas rogues are upsurpers. Bur right now all I can think is Maybe Hunter or a revamped version of hon who wants Wakanda to be isolated, Because they believe Wakanda is best when it Looks out for itself. Or Achebe could work that angle
Not me, it would take a ton of digging, but early on I said that BP 1 was going to do IM 3/ CW numbers based on the hype that T'chadwick received and how people were losing their minds on his debut. Folks thought o was shooting too high.. Turns out I was in the right ball park