Misidentifying Ones and Nines
Usually this mistype is caused by confusion about the wing and dominant type: is the person a Nine with a One-wing or a One with a Nine-wing? In some cases, with a strong wing, this can be a difficult call. Both can be idealistic, philosophical, and somewhat withdrawn. Neither feels comfortable with their anger. Usually, the Nine's reluctance to get into conflicts is the easiest way to discern these adjacent types. Average Nines want to maintain peace in their lives, and while they may hold strong personal convictions, they generally do not want to argue about them with people–especially people with whom they have an emotional attachment. For Ones, however, the principle is foremost, and Ones will drive home their point to convert the other to their view, even if it risks creating upsets and arguments. ("The truth is the truth.")
While Nines can be hard workers, it does not take much to convince them that a break would be useful. They enjoy down time, and tend to have difficulty shifting gears from relaxation to activity or vice versa. Ones are extremely driven and have difficulty tearing themselves away from their various projects to take a rest or relax. They feel anxious when they are not being productive (like Threes), and want to get back to work to avoid attacks from their superego.
Another distinction can be found in how the two types handle stress. Nines initially become more emotionally disengaged and resistant, but eventually become more anxious and reactive as they go to Six. Ones, initially become more fervent in their efforts to convince the other that they are right, but then collapse into moodiness and a tight-lipped testiness as they go to Four.