Thread:Terry Washington/@comment-2188103-20180924170057/@comment-4651179-20180924210900

The answer is not that deep. Black Panther hasn't been a consistent member of the Avengers, and during his longest (yet interrupted) tenure with the team (-88 and #105-126), the position of chairperson was rotatory. Even then, he did assume said position, being an example of that.

His other times with the Avengers were also short-lived (-181, -4, and -#76). After that final instance in 2004, he didn't rejoin the Avengers until this year, 14 years later.

Additionally, nothing indicates that a hero's status outside their team has to have an effect on their position inside the team. Thor is also royalty, not to mention a warrior with centuries of life experience, yet he's not the posterboy for leader of the Avengers. Tony Stark is the head of a multinational conglomerate, yet as part of the Avengers he has followed orders more often than giving them. Furthermore, since he's the king of a foreign land, T'Challa has always been somewhat of an outsider within the Avengers.

As for the other topic, T'Challa is also routinely referred to by his royal rank. On the other hand, I have yet to read a comic in which Doctor Doom is.