Attainment of Vaikuntha is only possible only if Shiksha and Diksha are performed by a bonafide sampradaya.
Devotional services should be “unalloyed”, without any mixture & impurities.
A guru trains his disciples to become Krishna dasa, a menial servant of Krishna.
Lord is ‘Bhavagrahi Janardan’. Even your ‘bhava’ counts, you get credit for that.