Quoting%20commentary for Sukkah 14:3

וצריכא דאי אשמעינן מבוי משום דאיכא שתי דפנות מעלייתא אבל גבי פסי ביראות דליכא שתי דפנות מעלייתא אימא לא

And [all the three laws were] necessary. For if he had mentioned only [the law relating to] the alleyway one would have assumed [that there the sukkah is valid] because it had two proper walls, but that in the case of partitions of wells, which do not have not two proper walls, the sukkah is not valid.

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