פירוש על קידושין 41:16

Abaye raises another difficulty against R. Sheshet who held that houses in walled cities cannot be redeemed by relatives.
A midrash reads the repetition of the word “he shall redeem him” as indicating that all cases of redemption have the same “order of redemption” that appears in connection with a Hebrew slave sold to a Gentile—first the brother should redeem him, next the uncle or some other relative and if not, then anyone else. So too, Abaye argues, when it comes to houses in walled cities or Hebrew slaves sold to Jews.

The Talmud resolves Abaye’s difficulty by saying that the midrash refers only to houses in villages and ancestral fields.
But again, there is a problem, same as above. We have a verse that explicitly teaches that houses in villages have the same rule as ancestral fields. So why would we need a midrash to teach that.