جِئْتُ أَنَا وَزَيْدًا: accompaniment wāw and accusative Zayd, “I came with Zayd.”
جِئْتُ أَنَا وَزَيْدٌ: coordinating wāw and nominative Zayd, “Zayd and I came.”
The text treats them as two grammatical readings. Diagnose the wāw and the case marking together.