In «ضَرَبَ زَيْدٌ», Zayd is an overt subject. But «ضَرَبَ» can mean “he struck,” with an implicit subject pronoun «هُوَ» recoverable in context.
When the overt subject of a tanāzuʿ construction is assigned to the second verb, the first verb’s subject must be accounted for. An implicit pronoun is a syntactic analysis, not an extra written word.
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Tanāzuʿ al-Fiʿlayn — When Two Verbs Compete for One Noun
In «ضَرَبَ زَيْدٌ», Zayd is an overt subject. But «ضَرَبَ» can mean “he struck,” with an implicit subject pronoun «هُوَ» recoverable in context.
When the overt subject of a tanāzuʿ construction is assigned to the second verb, the first verb’s subject must be accounted for. An implicit pronoun is a syntactic analysis, not an extra written word.