A linking pronoun need not always be a separately written word. The subject implicit in a finite verb can also refer to an earlier noun. The decisive test is whether its antecedent is truly the intended bearer of the circumstance.
In رَأَيْتُ زَيْدًا وَهُوَ مُسْتَبْشِرٌ, the overt pronoun huwa refers back to Zayd. The conjunction supplies a clause-level link, while the pronoun identifies the individual whose state is described.
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Appendix to Faṣl and Waṣl: Circumstantial Clauses, Wāw and Pronominal Linkage
A linking pronoun need not always be a separately written word. The subject implicit in a finite verb can also refer to an earlier noun. The decisive test is whether its antecedent is truly the intended bearer of the circumstance.
In رَأَيْتُ زَيْدًا وَهُوَ مُسْتَبْشِرٌ, the overt pronoun huwa refers back to Zayd. The conjunction supplies a clause-level link, while the pronoun identifies the individual whose state is described.