Any early guesses on this large fowl partridge cochin?

[Bear and Dart]

Looks a lot like my three pullets at that age. Too young IMO to say, really. This was my first one at a week old. Was 100% dark feathering throughout.
View attachment 2243202

And at 6 weeks old:

View attachment 2243204

And at 5 months old:

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And two more we added this spring at about 3 weeks old (not the best Pic, but gives an idea of their coloring): These had a tiny bit more white on them, but also confirmed pullets.
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Also you’re chickens are beautiful.

 

[Bear and Dart]

When should I expect the maroon coloring to come in if he/she is indeed a boy?

 

[Rhodebar Lover]

Do you have updated pictures? I'm not sure the exact time, but it gradually developed it seemed, at least with my Partridge Brahma cockerel