جِئْتُ أَنَا وَزَيْدٌ
Translation: Zayd and I came.
جِئْتُ: past verb with attached subject -tu.
أَنَا: detached emphatic pronoun.
وَ: coordinating wāw.
زَيْدٌ: noun coordinated with the nominative subject, hence nominative with ḍamma.
In this analysis Zayd shares the subject role. It is not an accusative accompaniment complement.
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Al-Mafʿūl Maʿahu: Accompaniment and Coordination
جِئْتُ أَنَا وَزَيْدٌ
Translation: Zayd and I came.
جِئْتُ: past verb with attached subject -tu.
أَنَا: detached emphatic pronoun.
وَ: coordinating wāw.
زَيْدٌ: noun coordinated with the nominative subject, hence nominative with ḍamma.
In this analysis Zayd shares the subject role. It is not an accusative accompaniment complement.