Bhai Mati Dass was Brahmgyani, Bhai Sati Dass was Brahmgyani, Bhai Mani Singh ji was Brahmgyani.
All Mata ji's ( wives, mothers) of Guru Maharaj were Brahmgyanis.
They were also Gursikhs, Gurmukhs, Sikhs, Sants....what else.....Sadhus, Mahatamas, Mahajeevs. Why you ask? because they, in the truest sense of these words, mean the same thing.
Doesn't matter if you call them Bhai Deep Singh, or Baba Deep Singh ji, or Sant Deep Singh ji. It all applies to them.
Any other questions R Singh ji?