[Avodah] Sukkah Yeshana

[Rich, Joel]

The Mishna in Sukkah (9a) discusses Sukkah Yeshana which one would have thought meant an old sukkah (schach) yet the discussion in the gemara indicates that it is an issue of lishma (intent). Why didn't the Mishna use the language of lishma?
The gemara then posits a pasuk as the source of Beit Shammai's position, then asks doesn't he need that pasuk for something else, and replies ein hachi name (yes) and so quotes another pasuk instead. What was the point of Ravina/Rav Ashi including the rejected pasuk as part of the record?
KT
Joel Rich

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