«أَمَّا أَنْ تَكُونَ لَا تَنَافِيَ بَيْنَهَا وَبَيْنَ رِوَايَةِ مَنْ لَمْ يَذْكُرْهَا، فَهَذِهِ تُقْبَلُ مُطْلَقًا»
Where the addition does not conflict with the narrator who omitted it, that addition is accepted in principle.
A reliable transmitter can remember a detail that another does not mention. The latter's silence is not a denial of the detail. A trustworthy, independently transmitted additional detail is therefore treated like a report that the narrator alone preserved.
Illustration: One account says a traveler arrived; another says he arrived after the afternoon prayer. The second adds a time without contradicting the first—unless separate evidence explicitly assigns an incompatible time to the very same arrival. This is an instructional illustration.