Epsilon is a year old and still mainly black. My first yorkie, Gizmo, was mostly black when he died at a year and a half. My mom's yorkie Ruckus is a little over a year and still mostly black.
All these dogs are still pretty young and I've heard that you don't really know their true color until they're about 2 years old.
My mom's other yorkie is almost 2.5 yrs old and blueish silver with a blonde head and it was obvious at a young age (like 5-6 months) that his coat was going to be this color.
Don't know if this helps