User blog comment:Chrismh/Your Choice for Protagonist?/@comment-26426093-20170220070456/@comment-30886579-20170220104359

According to ep 11 the talk show with Makisugi Makiko, Hime already became S4 since her very 1st summer(most likely because of her training against her progression aura). But for Tsubasa, it is true that she only became S4 when she was promoted to F3, as shown as ep 18 when Tsubasa wearing admin uniform congratulating Yuri being in Aikatsu island.

As for Yozora it is unknown that when she became S4. So most likely from Yuri's perspective, she will see S4 Hime, Admin Tsubasa and Yozora.