زَيْدٌ نِعْمَ الصَّدِيقُ
Zayd is an excellent friend.
If Zayd has just been discussed, context may sometimes identify him without renewed naming. But if the cue is weak, a long interval has passed, or the audience has shifted attention to someone else, repeating “Zayd” removes ambiguity.
The motive is not necessarily intensification. Sometimes the priority is identifying the intended referent. When an earlier cue exists but is too weak to trust, explicit naming better serves effective speech.