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I'd like to add that as far as timing is concerned, Tolkien need not be constrained by the events and timeline of the 1977 constructed Silmarillion. For example, he's shifting the Awakening of Men back in time to account for the breeding of "regular" orcs from Men while Melkor was in Aman (text 10) -- [pushing it back even more than 3500 Sun Years according to CJRT, if the Awakening of Men is placed even very late in the period of the Great March of the Eldar]
Orc-formed Maiar can account for some early "real" orcs (not delusions). Utumno was broken in Valian Year 1099, so roughly four hundred Valian years elapsed before Morgoth made his first assault on Beleriand in 1497.
And Tolkien here notes (again, text 10) that the breeding of Orcs had already begun before Morgoth was made captive.
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