There are many star gods that the Heavenly Court has sealed, but not many star monarchs.
After Hao Tian took the throne, in order to distinguish between star monarchs and star gods, and also to elevate the status of star monarchs, he set the Star Monarch Tai Yang and Star Monarch Tai Yin as the threshold for star monarchs.
This was a clear case of pulling rank.
Not even the Cultivation Path Ancestor Hong Jun might be able to seal the authority of the Sun Star and Taiyin Star, let alone Hao Tian.
In the era of the Demon Heavenly Court, the equivalent of the Sun Star Monarch was the Demon Emperor Di Jun and Eastern Emperor Taiyi among the Demon Race Four Emperors, while the Star Monarch Tai Yin was also the sixth highest ranked in the Demon Heavenly Court, once suppressing a top Quasi-Saint like Jie Yin.
The fact that the New Heavenly Court set the Star Monarch Tai Yang and Star Monarch Tai Yin at the T1 grade shows the importance the Heavenly Court places on the star monarchs: