Kong Xiang's situation was actually a bit special.
After completely assimilating his Eternal Tributary into the Star River authority of Citar and integrating the divine blood runic framework, the three merged to become one.
Dao Constellation Sea.
Kong Xiang retained control of it based on his triple connection with the base components; the Eternal Tributary was his natal dao manifestation, he now held the Star God Deity position evolved from the Comet God status and thus controlled the infinite stars, and the divine blood runes that added the final touch carried his refined imprints.
So, it was alright to assume that the Dao Constellation Sea was akin to Kong Xiang's divine ability, Kong Xiang's new Deity Seal, and Kong Xiang's refined Divine Blood Rune essence all at the same time, evolved and bugged up into this completely new heavenly product with limitless potential.