Saw these today

[finchbreeder]

I do not understand why if these birds have not had dilute or cinnamon show up before today, you would think a normally sex linked gene would be more likely than a normally recessive gene? Please explain? Is is just because of the slight brownish wing tips? Not necessarily disagreeing, just wanting to understand the though process.
LML

[Blue Cuban]

I'm not sure of the genetics so no comment but what wonderful looking birds.