Zhang Ruochen had already seen that the strength of Nan Sheng's spiritual power had reached the 68th class. With his age, this was an outstanding achievement.
Although Zhang Ruochen's spiritual power was also in the 68th class, a Supreme Saint who specialized in the Path of spiritual power and a Supreme Saint who used spiritual power as support were not in the same category. Moreover, Nan Sheng comes from South Haven as well.
Even ten Zhang Ruochens combined would not be a match for the Nan Sheng if it were a spiritual power battle.
Therefore, Zhang Ruochen had no intention of competing with Nan Sheng's spiritual power.