After the betrayal of Zarkon, It was difficult finding a new Paladin for the Black Lion. Where accepting the position would instantly be put on top of Zarkon’s kill list. The King himself piloting was too much of a high risk and the Black Lion herself refusing to search out for potential candidates since the broken trust of the previous Pilot.
At that moment, only one name was coming to Coran’s mind that had the chance to reach out to the Black Lion and lead Voltron.
in other words, I just realised how well ‘Xom’ fits in the Black Paladin role.