Rather than a little dragon, it was more like a Dragon Egg that had yet to fully hatch. After you killed the Ice Bird and retrieved the Dragon Egg with a tiny crack in its shell, Xuanwu Zi still had to help it enter the world.
Fortunately, after Xuanwu Zi tested the little dragon's bloodline with a Treasure Pearl he carried, it proved to be the bloodline of the Sea-Covering Dragon Emperor. It was simply unknown why this Dragon Egg had existed here, and why it had only recently shown signs of hatching.
There were too many coincidences in the world. You and Xuanwu Zi merely deduced that this was not some person's scheme or trick, then neither of you investigated it too deeply. The little dragon had only just been born and was still far too frail. How to bring him back became the problem Xuanwu Zi needed to solve...
Your heart was kind—or perhaps you simply wanted to fulfill the three Dao oaths you had once made to the Sea-Covering Dragon Emperor sooner. Thus, you took the initiative to suggest letting the little dragon enter your Immeasurable Universe and follow you first to Qingming Hetong Heaven, where he could live for the time being in the Dragon Realm of the Spirit Palace. Once his cultivation had achieved something and he possessed some means of self-protection, Xuanwu Zi could bring people into the cosmic region to take the Little One away.
It was not as though Xuanwu Zi had no other solutions, but every one of them came with a certain price. Compared to them, your method had no drawbacks at all. The Spirit Palace, which had long maintained ties with the dragon clan of the Three Pure Heavens, could already be considered half their subsidiary. Thus, Xuanwu Zi