Who can best represent the unfinished spirit of calligraphy in Wei, Jin, Southern and Northern Dynasties and Sui Dynasty?

For example, the representative works of the North-South School include Nan Liang's Yi and the Northern Wei Dynasty's Zheng Wengong Monument, which can be described as the North-South binary star. Most of the northern writers are Shu Ren, whose books are anonymous, so the history of calligraphy calls northern Wei calligraphy folk calligraphy. In terms of names, Zheng Daozhao and his son were crowned as "the saints in the book" and Wang Youjun of the Northern School.