Why did Srila Prabhupada have not instructed directly ti his disciples.
Mu Guru Maharaj was one of the Personal assitant of Srila Prabhupada, but he never refers to Gauranga mantra.

Shouldn't be a system only establish by Acharyas like Srila Prabhupada or Srila Bhakti Sidhanta Maharaj. Srila Prabhupada is the most modern Acharaya . Should we not follow his direct orders which he told to his disciples and then they (My Maharaj) told to me, following a exact paraampara system (Sruti)