if the gemara reaches the maskana that zevuluns complaint wasnt about "zavat chalav udvash" since his chelek was about 1/8 of the whole zavat chalav udvash of the whole Eretz yisroel. why would his complaint be about sadot ukeramim? hence you need sadot ukeramim in order to have zavat chalav udvash
menachem kabacznik, brooklyn, ny
Sholom Rav.
I think that the following comment will answer your question. "Zavas Chalav u'Devash" concerns quality specific fruit, Zevulun wanted more vineyards and more fields in order to grow all kinds of fruit and vegetables as well as for building and other purposes.
Be'Virchas Kol Tuv.
Eliezer Chrysler