Pure devotee starts from a madhyama. Madhyama is a pure devotee. We will say 'pure devotee' and then put it way off in the distance. No, pure devotional service can be performed from niṣṭhā.
Sometimes we find ourselves attracted to young women, just minding their own business and walking by, and this attraction is disturbing, to us and to the women. How can that go away?
Everybody is following Prabhupada as the Founder-acharya, so if we're involved in something that's useful within that mission, then taking the instruction of guru to see that you're doing that, that's following the instruction of the guru.