There was another world. A real one.
One that is not VIRTUAL, nor created after MEMORIES.
A world that is not Duel Links.
SCUD was killed there, in that world.
When Duel Links was re-created, cloned from that different existence, he was sent here for some unknown reason, only Kaiba knows. So, he's technically a Ghost. That's why many people don't see him when you unlock his missions.
Anonymous
Aigami?
