The title of this article is conjectural.

Although this article is based on official information from the Star Wars Legends continuity, the actual name of this subject is pure conjecture.

"There's more at play here than you can guess and my master wants the Mandos out of it."
―Yaga Auchs to Hondo Karr about his master's plans.[src]

This mysterious person was the true master of Yaga Auchs. They wanted to keep the Mandalorians out of the Sith–Imperial War and did so by making Yaga keep all Mandalorians based on Mandalore.