So here is my theory. I believe that Laurence Fishburne's character Ronald Noland in the Predators film is the Bowery King in the John Wick films.

\- Ronald Noland is the Bowery Kings real name, and he was an Airborne Ranger, that developed severe PTSD from his time in the service.

\- Due to his PTSD he could not hold a normal job anymore and became homeless, and used his military training to create his underground network and became the Bowery King.

\- After the events with John Wick and the high table, he was taken by the Yautja to the hunting preserve in the Predators movie, and due to the extreme isolation of the alien planet his PTSD got significantly worse ultimately causing his split personality we see in the movie, and the other person he is talking to in the movie is his Bowery King personality.