The Miyuki's famous bloodline of the Shimian Specter has its limits. This bloodline can gain the user advance knowledge of the element that will be insert in the bloodline. But it'll be taught from the teachers, as well it'll come from using the bloodline in practice spars and everything. They will hopefully already have the basic knowledge of the element by the time they are taught this.
The bloodline may have stages, but none of the stages of the eyes have been revealed to any of the clan members yet. A good but yet triat that runs through most of the clan members is that the Miyuki blood does not have to flow through the user to unlock it at the present time. Another possibly to gain the eye to side branch members is if the teachers they are under, determines they are ready for the eye.