How does «كَانَ زَيْدٌ مُنْطَلِقًا» differ from «زَيْدٌ مُنْطَلِقٌ»?

Restricting the Verb: Objects, Complements and Conditional Clauses

• It makes Zayd a direct object
• It makes munṭaliq a demonstrative
• It inevitably produces exclusivity
• It locates the attribution of departure in the past