The Unity Dao Immortal Venerate, due to some reason, likely restriction, could not appear at will, so he could be temporarily disregarded.
And the majority of Daoist Venerables, because they need to cultivate, combined with the punishment of monetary fines, also preferred not to use their true forms.
Including that the resources of the Spirit Realm are for the use of the Spirit Realm, no one fancied taking them home, their demand for the territory and resources of the Spirit Realm was not great. In the Void Universe outside, they might fight to the death over resources, but within the Spirit Realm, there was not so much conflict of interests.
Therefore, Yu Xian, who could use his powers unscrupulously in the Spirit Realm, aside from those Daoist Venerables who proved their path through power, had no other rivals.
After all, fighting him, winning brought no benefits and would incur the punishment of the Heavenly Dao of the Spirit Realm, docking a sum of income.