The three cases should be distinguished by the source of their evidential strength.
First — the two Sahih collections: particular non-mutawatir reports, informed scholarly acceptance, and the stated limits involving criticism and unresolved conflict.
Second — multiple sound routes: a mashhur report supported by distinct, reliable transmissions free from narrator weakness and hidden defects.
Third — master transmitters: a sequence through distinguished highly accurate hadith authorities, without the specified solitude.
The first emphasizes specialized scholarly reception, the second independent sound corroboration, and the third exceptional narrator precision. Each has conditions of its own, and the relevant conclusion depends on the cumulative evidential context.