Gravis explained to Manuel how important it was to go through the Self Stage. Of course, he only did that via voice transmission. First of all, that method of communication was faster and more efficient since he could directly send concepts into another person's mind instead of translating them into language first. And second of all, this knowledge wasn't for everyone's ears. Other people's cultivation had nothing to do with him.
After Gravis was finished, Manuel's emotions were riled up. He hadn't gone through the tenth Stage of Energy Gathering. On top of that, he was ready to break into the Sapling Stage, which meant he had already invested 20 years into his cultivation. Hearing that he would be a doormat in the future and that all his work had been meaningless shook his confidence.
