The third case includes the explicit qualification «حَيْثُ لَا يَكُونُ غَرِيبًا» — the report must not be merely isolated in its transmission. A report through a great imam has obvious evidential importance, but the imam's stature alone does not necessarily fulfill every condition of this specialized pattern.
Case A: Only one narrator is established at a significant point; that solitude cannot be ignored.
Case B: Distinguished, highly accurate scholars are accompanied by other reliable independent narrators; multiple kinds of supporting evidence are then present.
Here the argument combines exceptional transmitter quality with a transmission history that is not solitary. Both elements matter in the stated description.