{Edited Loki}
Logically speaking, the two sisters understood that all this was possible because of Theo. Although Shina is talented, she did not reach a level of reaching the Magical Apprentice Kingdom at the age of 16. They themselves were grateful that with Theo's help, the two sisters were able to reach the Higher Student Kingdom in such a short time.
Moreover, with the construction of the school by Theo, the children of the Orphanage are stronger and more intelligent every day. His knowledge based on cultivating was getting wider and wider. Even the older girls at the Orphanage asked Theo to let them attend classes. Of course, Theo saw no problem in that and allowed it, since they helped him a lot.