Wuḥdān asks how many identifiable pupils report from a transmitter. Majhūl al-ʿayn adds the problem of insufficient identification and evaluation. The categories may overlap, but they are not interchangeable judgments.
Suppose a narrator is known through only one pupil yet receives an independently credible declaration of reliability. The one-student pattern remains true; nevertheless, the narrator cannot simply be dismissed as unknown on that ground alone.
Conversely, knowledge of a name plus a single pupil without adequate evaluation leaves a critical question open. The number of students must not be confused with proof of moral integrity or reliability.