زَيْدٌ حَسَنٌ وَجْهًا — زَيْدٌ حَسَنُ الْوَجْهِ
With accusative or genitive dependents, an implicit pronoun in the adjective links it to the qualified noun. With a raised dependent, that noun itself fills the subject position.
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Implicit Pronoun in Accusative and Genitive
Ṣifah Mushabbahah: Stable Qualities, Government and 18 Patterns
زَيْدٌ حَسَنٌ وَجْهًا — زَيْدٌ حَسَنُ الْوَجْهِ
With accusative or genitive dependents, an implicit pronoun in the adjective links it to the qualified noun. With a raised dependent, that noun itself fills the subject position.