It seems normal upon reflection.
Lu Yuan had gathered the essence of the entire Nine Provinces realm, and after his ascension to the Immortal Realm, he was able to produce three True Immortal avatars in one go, ultimately achieving his current fortunes.
At that time, although Purple Cloud Tao didn't have conditions as favorable as his, it had been the leader of the Yangzhou Immortal Sect for tens of thousands of years, so naturally, there was some foundation.
That foundation, previously in the Nine Provinces realm, might have been unusable due to the lack of Spiritual Energy.
But once in the Immortal Realm, it turned worthless into treasure.
From original waste, it became a Heaven and Earth treasure that could be transformed.
With these foundations, it's not surprising that Daoist Real Mystery and other Nine Provinces cultivators could produce one or two Immortals.
It's just that the lucky one happened to be Zhen Xuan.
