Yes, koans can certainly be used for personal growth and self-discovery even without pursuing sudden awakening. In fact, this is one of the main purposes of koan practice in Rinzai Zen.

Koans are short, paradoxical statements or questions that are used as a tool for meditation and contemplation in Rinzai Zen. They are designed to challenge the logical mind and break through habitual patterns of thinking, leading to a deeper understanding of oneself and the nature of reality.

Through working with a koan, one is forced to confront their own limitations and preconceived notions, and to let go of fixed ideas and attachments. This process of self-inquiry and introspection can lead to personal growth and self-discovery, as one begins to see things in a new light and gain insight into their own thoughts, emotions, and behaviors.

Furthermore, the practice of koans can also help develop qualities such as patience, perseverance, and mindfulness, which are essential for personal growth and self-discovery. As one continues to work with a koan, they learn to approach it with an open and curious mind, rather than trying to solve it with the intellect. This cultivates a sense of humility and surrender, allowing for a deeper understanding and connection with the koan.

Moreover, koans can also be used as a means of self-reflection and self-exploration. By contemplating on a koan, one can gain insight into their own inner workings and uncover hidden aspects of themselves. This process of self-discovery can lead to a greater understanding of one's own strengths, weaknesses, and areas for growth.

It is important to note that the pursuit of sudden awakening is not the only goal of koan practice in Rinzai Zen. While it may be an ultimate goal for some practitioners, the primary focus is on personal growth and self-discovery through the practice of koans. Therefore, even without pursuing sudden awakening, one can still benefit greatly from working with koans.

In conclusion, koans can certainly be used for personal growth and self-discovery in Rinzai Zen. Through the process of self-inquiry and introspection, one can gain insight into themselves and the nature of reality. Koan practice can also cultivate important qualities and aid in self-reflection, leading to personal growth and self-discovery.