I have had this idea in my head for about a month now as to the nature of types along axes in a way which graphical illustrates the dual-seeking nature of types and distinguishments between sub-types and types within quadras. I used Alpha Quadra as the graphical example below. In some ways, the INTj (Ne-Subtype) is similar to the nature of the ENTp, while the ENTp (Ti-subtype) has its share of similarities with the INTj. This can almost be explained as the concentration of relative Ti or Ne present. So sub-types represent the degree or relative position along an axis.