According to Osho, only Buddhas can found a true psychology: from the state beyond mind they have the distance, clarity, and freedom from prejudice to see the mind objectively. No-mind itself can’t be systematized, but it can illuminate the valleys of mind from the hilltop. Psychologies built from within mind—Freud, Adler, Jung—are colored fictions; a real psychology would be singular and unbiased.
Like someone who climbed out of a muddy river, a Buddha can clearly describe the water; those still splashing inside can only guess.