Calling a report mashhur, aziz, or gharib describes the distribution of its routes; calling it sahih, hasan, or daʿif evaluates its admissibility and reliability. The two schemes answer different questions.
Question 1: How many independent routes exist? This determines the distribution category.
Question 2: How reliable are those routes? This calls for examination of transmitters, continuity, precision, and relevant defects.
Several chains can share a serious weakness, so their number alone is not proof of soundness. Conversely, a gharib report is not necessarily weak simply because it contains a lone transmitter; a singly transmitted report can be authentic.