According to Osho, Manzan did attain mastery. In Zen, faith and belief are dust; a true master speaks from being, not from scriptures, and his living presence carries a tangible energy that quenches your thirst. Distinguish teacher from master through open-hearted receptivity: when your heart dances and a deep rapport arises—the Great Love Affair—you’ve found the real thing.
Yes—Manzan became a true master; you recognize a master not by clever words but because being near him makes your heart feel clear, alive, and at home.