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.
To the blues that are confused, how about adding the non-laced blues (called self-blue in other parts of the world)?
Now you need to publish it all in a handy book! I'll buy the first copy if you autograph it