جَاءَ كِلَا الرَّجُلَيْنِ. — Both men came; كِلَا is nominative with estimated case.
رَأَيْتُ كِلَا الرَّجُلَيْنِ. — I saw both men; كِلَا is accusative with estimated case.
مَرَرْتُ بِكِلَا الرَّجُلَيْنِ. — I passed by both men; كِلَا is genitive with estimated case.
Result: When annexed to a visible noun rather than a pronoun, كِلَا stays visibly unchanged, and its case is estimated.
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Noun Case Classes: Type 5 — The Dual and Related Forms
جَاءَ كِلَا الرَّجُلَيْنِ. — Both men came; كِلَا is nominative with estimated case.
رَأَيْتُ كِلَا الرَّجُلَيْنِ. — I saw both men; كِلَا is accusative with estimated case.
مَرَرْتُ بِكِلَا الرَّجُلَيْنِ. — I passed by both men; كِلَا is genitive with estimated case.
Result: When annexed to a visible noun rather than a pronoun, كِلَا stays visibly unchanged, and its case is estimated.