Which evidence can be decisive when evaluating Ṣāliḥ mawlā al-Tawʾamah?

The Necessity and Boundaries of Narrator Criticism

• The proportion of legal material in the report
• A student attending Ṣāliḥ’s mosque without a known hearing date
• Whether a student heard before or after his deterioration
• A chain becoming reliable because the name and kunyah are consistent