مَا رَأَيْتُ رَجُلًا أَحْسَنَ فِي عَيْنِهِ الْكُحْلُ...
Negation and the unusual dual-perspective comparison explain this special construction. It is not a general licence to give every elative an overt subject.
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Why This Is an Exception
Ism al-Tafḍīl: Formation, Comparison, Agreement and Parsing
مَا رَأَيْتُ رَجُلًا أَحْسَنَ فِي عَيْنِهِ الْكُحْلُ...
Negation and the unusual dual-perspective comparison explain this special construction. It is not a general licence to give every elative an overt subject.