It's pathetic how Yasuke has basically become accepted as a real person who definitely existed. The propaganda has been put on repeat and pushed for so long now that any debate of his actual existence is over.
Talk to any retard and they will not even entertain the idea that the "evidence" from Jesuit writings may have been fabricated or embellished for the sake of a promotion. They will merely say that there is other evidence, without knowing what that evidence is. The idea of even questioning his existence is seen as taboo to the average normie. Even people who are against his inclusion in Assassin's Creed are merely arguing that he was only a "Retainer" and not a "Samurai," giving legitimacy to the historical revisionism that is being attempted.
The overton window will continue to shift to the point where Yasuke's existence will be elevated to "he was an important warrior in Nobunuga's army" because leftists and dishonest Historians will pull shit out of their ass and reference each other in circular reporting until the normies begin to accept it as true because it makes them sound smarter to know some random historical fact.
I'm not sure if I'm answering the right question here, but
Yes a bunch of slaves were brought to Brazil under Portuguese control. The Jesuits would be the type to rescue a dude, too. If they came into "possession" of a slave, he might travel with them.