دَلْوِي : the lexical stem ends in wāw; sound-like pattern here.
ظَبْيِي : lexical yāʾ follows a consonant with sukūn; also treated as sound-like here.
قَاضِيَّ : lexical yāʾ is preceded by kasrah; it assimilates to the possessive yāʾ.
The vowel before the final radical determines which rule applies.
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Iḍāfah to Yāʾ al-Mutakallim and the Six Nouns
دَلْوِي : the lexical stem ends in wāw; sound-like pattern here.
ظَبْيِي : lexical yāʾ follows a consonant with sukūn; also treated as sound-like here.
قَاضِيَّ : lexical yāʾ is preceded by kasrah; it assimilates to the possessive yāʾ.
The vowel before the final radical determines which rule applies.