Sentence Correction (SC) | Zhuangzi had an interpretation of Daoism that was highly imaginative,

Hi Mike,
Can you please elaborate on the use of had in option D. On one side we have didnot have, whereas on the other side we are using had

D) Zhuangzi’s interpretation of Daoism, though highly imaginative, did not have as lasting an impact on the course of Chinese civilization as had his contemporary Mengzi’s interpretation of Confucianism

I thought that option D would be correct if the sentence were written down in either of the below two formats-

1) Zhuangzi’s interpretation of Daoism,