The Almighty Wind Celestial Emperor

In the Purple Spike Celestial Emperor's opinion, it was impossible for someone of Duan Ling Tian's age to possess such strength in a short time. However, if Feng Qing Yang, the Heavenly Emperor of the Solitary Destructive Heaven, took Duan Ling Tian in long ago, it was not impossible for Duan Ling Tian to possess such strength under Feng Qing Yang's care. However, since Duan Ling Tian was only recently accepted by Feng Qing Yang, it meant that Feng Qing Yang did not have much to do with Duan Ling Tian's current strength. How was this possible? How did Duan Ling Tian grow so strong without Feng Qing Yang's help? Such strength could not be attributed to luck alone.