Note that Jude refers to "Enoch, the 7th from Adam", instead of saying Enoch, son of Jared,
and LEAVING OUT the fact that this was a 'second' Enoch, rather than the son of Cain.
I see it as a crumb clue (seed) about counting the Generations, and a kind of trope 'hysteresis' which
is only revealed in the latter pages of the 66.
And all the people went "to make great mirth, because they had understood the words that were declared unto them". Neh8:12
"The foolishness of God is wiser than men; the weakness of God is stronger than men". 1Cor1:25
Dux allows: "It is the glory of God to conceal a thing: but the honour of kings is to search out the matter". Pr25:2