The Ramakrishna mission although it does not come out of the above six schools of philosophers—generally they prefer to call themselves as Sankarites or belonging to the Mayavada school. Interpretations of Vedanta made by them are neither Mayavada nor Satvatta. They have their own interpretation different from the Vyasa school of philosophers.
Other Acaryas such as Ramanuja, Madhva etc and lately Sri Caitanya—all belong to the original Vedantist school by direct disciplic succession.
According to these Acaryas Bhagavad-gita and Srimad-Bhagavatam are, in their original stand, the real commentaries of the Vedanta Sutras. The Mayavadins who do not actually belong to the Vedanta school have overcast a cloud unnecessarily over the Bhagavad-gita and therefore common people are misled by them. In other words they have no entrance in the Vedanta Darsana so to say.
It is not at all necessary that an ailing person shall oblige all classes of physicians for the sake of their being medical practitioners only. The patient must be treated by such physician only who is able to cure him.
Philosophical ways are practical and it is no use simply by indulging in speculation without any practical result just like to keep a cow without any milk. We must always seek a practical value from philosophy for the benefit of all. The mission with which you have started your service inspired me to help you as far as possible and I thought it fit to inform you that your mission can be well guided by the practical philosophy of the Bhagavad-gita.