زَيْدًا عَرَفْتُهُ
Zayd—him I recognized.
An object-fronted expression may be analyzed with an understood verb, especially when an overt verb later includes a pronoun referring back to the fronted noun. That raises a structural question: where does the rhetorical fronting actually occur?
زَيْدًا عَرَفْتُهُ is not syntactically identical to زَيْدًا عَرَفْتُ. The object pronoun affects the analysis, so ellipsis and emphasis should not be conflated.