So the principle is that whatever you are instructed by the Caitya Guru internally may be confirmed by the instructor or initiator externally.
In our conditional stage, we cannot worship Radha Krishna. Radha Krishna seva is for them who have developed spontaneous love for God.
The root cause of devotional service to Lord Krishna is association with advanced devotees. Even when one's dormant love for Krishna awakens, association with devotees is still most essential.
If one is infested with the ten offenses in the chanting of the Hare Krishna maha-mantra, despite his endeavor to chant the holy name for many births, he will not get the love of Godhead that is the ultimate goal of this chanting.