"Resurrecting peers of the same rank and clan" is something that would never have occurred during the Era of Holy Songs.
Back then, the decisions of who could be resurrected were entirely determined by the Hymn herself.
Typically, only those who had made significant contributions to the Federation and whose souls were perfectly preserved would be resurrected by the Hymn.
There were also some resurrection techniques known among civilians. For example, one of King Zhou of Shang's friends could recreate physical bodies.
However, civilians almost never resurrect cultivators of the same rank because the cost is simply too high—no one can bear it.
It was more common to see high-ranking individuals resurrecting those of lower ranks (like planetary-level parents resurrecting their children of the sixth or seventh rank).
For Su Yu, at a planetary level, to resurrect someone of the same rank from his clan—this had never occurred before in the history of the Holy Silver Federation!
