@Yuki - that is precisely what makes Fan so special. He doesn't think of what he has done as any major achievement. That means that he does not pride himself for defeating Tytania, probably because that battle itself is nothing astounding, and he himself is aware this. If he started bragging about his victory and attributing it to his skill, it will imply that his strategy before was the maximum of his tactical ability.

This awareness and humility signals to me that Fan is capable of more things, and he knows it. He simply does not have the drive to use it at present.