成唯識論述記 7.759

7.759

述曰：雖有遊觀而不明利，想微細故，非後三根。然說彼是已知、具知亦無妨也。不順三根，以不明利，故不說彼，非彼不攝。若不攝者，三無漏根攝無漏根不盡也。

The Commentary states: Although it has discursive contemplation, it is not clear and sharp because its ideation (saṃjñā) is subtle; hence it is not the latter three faculties. However, to say that it is the faculty of having known or of having fully known also presents no contradiction. Because it does not conform to the three faculties by not being sharp and clear, it is not spoken of as such, but not that it is not subsumed by them. If it were not subsumed, the three uncontaminated faculties would not completely subsume the uncontaminated faculties.