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I wasn't sure if the white leghorn in it causes the comb to develop sooner, even in pullets? I cannot have a rooster where I live, but I don't want to rehome it too soon just in case it is a pullet. I have never had a Sapphire pullet before and would love to see what the super blue eggs look like!
I think his offspring will be half brown egg layers and half olive-eggers, because he only has half of the two copies of blue egg genes.
Even a purebred White Leghorn pullet isn't going to have a comb like this at such a young age. I'd recommend starting the search for his new home now. It can take a while to rehome cockerels, and Leghorns and crosses thereof are likely to start crowing quite early.
I can't speak to exact nature of the eggs that would be expected, largely because I've never heard of a "Super Sapphire Layer" until now, although I'm not sure why such a cross would be thought to lay any bluer of an egg than their purebred Legbar parent or any pure Ameraucana.