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Sylphy defeated her brother at the end, despite everything he had done to try to defeat her, he simply couldn't compare to the immense power his big sister had cultivated through her life, which was over twice as long as his.
For some reason, despite how much he loved her, he felt frustrated, so angry with himself for not being able to stop her, and also devastated, because he thought he would disappoint everyone.
"At the end… I am a weakling…"
He covered his face in shame, as he started crying.
Despite being surrounded by so many incredible people, Zephyrus always felt like he wasn't enough, that he simply couldn't compare to anybody.
Even when considering Celica, her power and strengths were simply something incredible. In comparison, he often thought of himself as "not enough".