Sri Ramakrishna mission and the devotees claim that Sri Ramakrishna was an Avatar. Even Sri Ramakrishna declared that he was an Avatar. However, Puranas mentioned only 10 avatars of Vishnu. The only Vishnu avatar yet to come is the Kalki.
Even Gaudiya Vaishnavas, who claim Lord Chaitanya was an Avatar of Vishnu, show passages from Srimad Bhagavatam supporting the lofty claim.
What scriptural support is there in favour of the declaration of the Ramakrishna Mission?