One cannot simply become a Master by self-proclamation, declaring oneself to be the supreme master of the Western Spiral Arm of the Milky Way. In this Path there's one Master at a time serving as the Spiritual Head of a specific Community or Mission. When the current Living Master is about to leave the body, they will usually recognize and apoint the new Master. The current Master appoints the next one. This approach, despite human nature, has served the Sant tradition amazingly well over the years.
People purporting to be masters perpetuate themselves with false promises.
They exploit their followers to satisfy their greed. Bahu also warned his students to watch out for false teachers who want to be masters over others even though they've never been faithful and loyal disciples themselves. So ambitious leader-types bent on appropriating various aspects of the Path that they find attractive, come to feel that they need to reinvent themselves. Troubled or disgruntled followers might even decide to defect to the original Light and Sound group of the teacher. Rogue groups have desperately tried to cover their tracks.