Not all teachers are at the same level. Sri RamakRSNa and Sri RamaNa MahaRshi were fully realized and liberated souls. Such liberated souls may send forth their disciples as emissaries or messengers of their message. Not all their messengers will be fully liberated. Same for BengAli BAba and SwAmi RAma. Once the samskAras are completely burnt, what purpose will the teacher have?
Also distinguish between teachers and avatArs: those are descending Consciousness taking Manifestation for a purpose. Ascending Consciousness of jIvAs attaining liberation is not the same. Like bubbles at the base of a heated vessel.