زَيْدٌ أَفْضَلُ مِنْ خَالِدٍ.
The elative normally licenses an implicit subject referring to its described noun. Zayd is syntactically the topic, not an overt subject of afḍal.
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Usually an Implicit Subject
Ism al-Tafḍīl: Formation, Comparison, Agreement and Parsing
زَيْدٌ أَفْضَلُ مِنْ خَالِدٍ.
The elative normally licenses an implicit subject referring to its described noun. Zayd is syntactically the topic, not an overt subject of afḍal.