Actually, the word you've used there should be latter (an adjective). It's a problem of American usage that latter has converged with later.
We're talking about the Greek ὀψέ, though. It is an adverb, but later became used as a preposition (much like κατά [opposite of ἀνά] and several other adverbs turned prepositions). As a preposition, it governs the genitive. Adverbs do not govern cases of nouns.
My point was made with "late" in another post. But the arguments of scholars over opse reveal an equal convergence in Greek.
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