A report whose individual route contains a remediable weakness may rise, through credible independent support, to the overall classification ḥasan li-ghayrihi.
The phrase li-ghayrihi is important: strength arises from other supporting paths, not because the single original isnād suddenly satisfies every internal condition of soundness. By contrast, ḥasan li-dhātihi is graded by its own qualified transmitters, including a lesser degree of precision than the strongest ṣaḥīḥ route.
Thus independently corroborated material may move from uncertainty or remediable weakness to acceptance. The historical grading of the weaker narrator, however, does not magically change into that of a fully precise transmitter.