I'm pretty sure that in Europe/UK/Australia (breeders from those locations, please correct me if I err) there are blue gene birds without the darker hackles & saddles.
Somehow I missed the one you posted, but he still has the darker hackles & saddle.
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Did you do your search as chicken/ poultry?
I did a search as Avian...
As far as yellow tissue in the nasal cavity, I would thing that it would be normal. I would be more worried if it was Black or even White..
I will check some of my birds and see what I can find...