Basically, the goal of this is to officially implement the change of getting rid of the High 5-A tier. The proposal? Fuse it with Low 4-C, which should become Dwarf Star level on its place. Why dwarf instead of small? Because types of stars smaller than the Sun (baseline of 4-C) are called dwarfs:
https://en.wikipedia.org/wiki/K-type_main-sequence_star
https://en.wikipedia.org/wiki/Red_dwarf
https://en.wikipedia.org/wiki/Brown_dwarf