Tang Luo's understanding of the clan was simple. It wasn't about the strength of the power, nor the size of the territory, but a very simple thing - blood relatives.
The six members of Tang Zheng are the strongest in the Mortal Realm of the Tang Clan. They represent the most excellent members of this generation of the Tang Clan. If these people die, it would mean the end of the Tang Clan's lineage.
To a healthy clan, the end of lineage signifies stagnation in development. More importantly, the Tang Clan didn't need that many heritage artifacts.
Even if there were a hundred thousand spiritual armors in the treasury, the number of blood relatives eligible to wear the spiritual armor in the Tang Clan was finite. The vast resources in the Dragon Boat Treasury were beyond what the Tang Clan could currently utilize. Even if the Tang Clan encouraged reproduction and constantly selected talents, it would take five generations to fully utilize these heritage artifacts.