The following quotes clearly indicate that Srila Prabhupada’s teachings do not describe a so-called diminished diksha gurus:
1. It is illegal to become a spiritual master if one is unable to deliver the disciple.
2. One should therefore approach an authorized person to understand Krishna. The spiritual master has actually seen Krishna; therefore he can explain Him properly.
3. As indicated here by the word manastah, the Supreme Personality of Godhead was transferred from the core of Vasudeva’s mind or heart to the core of the heart of Devaki. We should note carefully that the Lord was transferred to Devaki not by the ordinary way for a human being, but by Diksha, initiation. Thus the importance of initiation is mentioned here. Unless one is initiated by the right person, who always carries within his heart the Supreme Personality of Godhead, one cannot acquire the power to carry the Supreme Godhead within the core of one’s own heart. (SB purport).
4. Their constitution, first word is “the king can do no wrong.” Yes, that is the Vedic system. Suppose a king beheads somebody by his own sword, as it was being done. Nobody can charge him that “Without any trial he has killed this man.” No. Whatever is done... Just like we take Krishna, apapa viddham. Krishna is never touched with any sinful activities. Apapa-viddham. Tejiyasam na dosaya. Just as the sun, because it is very, very powerful, nothing can infect it. These are the dangers. (Hindi?) Of course, if you want to keep one in very exalted post, at the same time, if you want to find fault with him, then that is not good. That is not good. That is also stated, that arcye visnau sila-dhir gurusu nara-matih. If somebody thinks that the Deity is made of stone and he criticizes, that is not allowed. If one thinks spiritual master as ordinary human being, that is not allowed. Arcye visnau sila-dhir gurusu nara-matih. So those who are in highly exalted post of the state, you cannot find out fault with him. That is real Vedic way. Otherwise, if he is taken as ordinary citizen, then he is... What is the meaning of his exalted post?