Wu Ni had indeed comprehended a six-star dao pattern, but he had never announced it. Not even the majority of the Wu clansmen knew about it, apart from his father who knew about it clearly. This was Ji Tingyu's stratagem as there was no benefit in declaring that Wu Ni had a powerful dao pattern. Why not release it when facing the enemy which would have the element of surprise. At the same time, when it was released in combat, it would help boost Wu Ni's fame even more!
Right now was rather good timing. Bai Yi might be a nobody in the past, but after the incident outside the Purgatory Ruin, Yin Ruobing, and the Buddha Emperor's palm strike was inevitably going to help Bai Yi's name rise in reputation. Right now, if his ability to release astral winds was to spread out, Bai Yi's name would certainly become a hot topic.
