Ah, here’s a guy who understands the difference between esoteric Christianity and mystic Christianity and can actually articulate it fairly well:
Esoteric Christianity is often, as in the case of this table, seen to be synonymous with Mystical Christianity. However, the fit is not quite exact. Esotericism is characterised by two main features: (1) an inner body of knowledge or interpretation of exoteric religious forms that were (2) taught to an inner group of students or practitioners. Mysticism, the practice of conscious personal communion with the Divine, can and is practiced by Christians who are not esoteric in the traditional understanding of that word and whom are not part of any inner tradition. Moreover, the majority of Christian mystics have never heard of Leadbeater and would be disturbed by much of his Christology which is reproduced in this table.
I commented on the same table elsewhere, as similarly, I feel it is unclear whether mystic Christianity should be labelled esoteric or exoteric under this schema, given that it is both orthodox and inner directed. You see, I’d quite happily accept the mystic label myself, but I’d feel very uncomfortable with an esoteric label (given the contemporary associations with reincarnation) but also with an exoteric label (given the contemporary associations with dry institutionalism).