No, we just say that he didn't appoint any gurus.
Those appointments were to ritvik positions.
Other than that, Srila Prabhupada said many times that his disciples would also have to become spiritual master.
In fact, in the act of becoming a true disciple one is duty bound to continue the legacy of the Sankirtan movement.
To become a disciple brings with it the responsibility of becoming guru if the situation requires.
But, there are many senior devotees that can act as guru.
Junior Godbrothers should just refer candidates to the senior devotees like Narayana Maharaja, Govinda Maharaja etc. etc.