The problem there is that in attempting to reconstruct ancient pronunciations, we rarely have much to go on besides what we can deduce from the sound-patterning of the language's surviving verse, whether rhyme, assonance, or alliteration; and that doesn't help much with medial consonants and consonant-pairs.
Occasionally orthography helps, as a sound-shift can be traced in a spelling change over time and/or colloquial spellings; but that's no help with -ng since there wouldn't have been an alternate orthography, "J" not existing in OE (except as an alternate written form of the vowel "I")
So -ng is really anybody's guess, depending on whether one wants to use "frog DNA" from mod. German, or from Dutch-Frisian which is a closer cousin. FWIW, I'm disposed to think that dzh- in English, spelled either J or G, is a French import. But I certainly have no evidence to back up my gut there.
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The entire plot of The Lord of the Rings could be said to turn on what Sauron didn’t know, and when he didn’t know it.
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