They literally have no choice. They have to have a black guy and it's either Stewart or Cyborg.
They already announced Cyborg for Justice League and signed up an actor for him months ago, and they also announced a Cyborg solo movie and a Wonder Woman movie before 'Marvel's' announcement for Black Panther and Captain Marvel... which had people saying BP and CM was
Marvel's quick response to DC announcing a black and female led superhero film.
So that is why people were skeptical that John would make the cut since there was already a token "black guy" announced and a host of other ethnic groups that they obviously could have went with for "diversity". But if these rumors are true.. it'll be both Stewart and Cyborg in the JL's big 7.
Cyborg is whatever but... why would 'blacks' celebrate one of the GOAT black characters making it to the big screen? fukk type of question is that?