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The blue colour when on extended black typically has a darker head (and shoulder/saddle on males). When it’s a blue copper you ideally want the copper to replace this so that the blue itself is pretty even across the board (though each feather should be laced darker). I’ve seen many blue coppers without copper, a lot of the time these are hatchery birds or even hybrids being called blue copper marans.

Mine have always grown copper in early on, at the same time as the black coppers, but my line is fully coloured so that helps a lot.

That’s all I can really say on the matter, but here are some examples of my blue coppers at various ages:
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They'll be 12 weeks on Tuesday. I had a Blue Copper Marans pullet that died shortly after she started laying due to a a reproductive issue. She never got any copper either. Maybe you're right, just hatchery quality.

Speaking of coloring, the lighter Blue actually has darker spots. I don't know enough about chicken genetics (yet) but I'm assuming this would make sure more of a splash or something?

You can kind of see the darker spots in these photos:
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She’s a blue, those tiny black specs on some feathers are just random, though I can’t see I’ve seen them before. A splash is much paler and has much less even colouring. I’d like to see how these grow out because either they are hatchery quality or you might have solid blue marans (which aren’t a typical variety but can technically happen).
 

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