Within Qin Huai's arsenal of techniques, many were suited for manipulating objects, but these were mostly limited to the bone pattern level.
Once he had fully integrated the spirit bone, its innate bone patterns were dissolved by the soul's might. This power then merged with Qin Huai's seven primary bone patterns, enhancing their strength. The cultivation techniques from the denizens of Qingzhou City, which he had absorbed from the blood sea, were converted into nourishment for these seven patterns.
Though Qin Huai had hoped to retain the bone pattern level disguise technique, he found himself unable to stop its transformation. Regardless, such a technique wouldn't have been useful beyond the spirit bone level.
At the very least, concealing his true self from those visceral prefecture realm experts would not work. Ultimately, these minor techniques held little value to him. Transforming them into nutrients seemed their best destiny.