In لِزَيْدٍ وَعَمْرٍو, the noun after the wāw inherits the genitive case of Zayd because it is coordinated with it.
This differs from مَا لَكَ وَزَيْدًا, where the book requires accusative accompaniment.
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How Coordination Preserves the Genitive
Al-Mafʿūl Maʿahu: Accompaniment and Coordination
In لِزَيْدٍ وَعَمْرٍو, the noun after the wāw inherits the genitive case of Zayd because it is coordinated with it.
This differs from مَا لَكَ وَزَيْدًا, where the book requires accusative accompaniment.