Singularity type manifestation techniques ensure a particular kind of manifestation, however, so does the bloodline of families. Ri already made it clear to him that only major families have Singularity type techniques. Yet, Jade just said that the Benes family gained an advantage because of their manifestation. This meant, that while the technique plays a role, so does a person's bloodline, which is probably why the major families were the most powerful.
When Dyon thought of Mithrandir, from talks around him, he knew that her manifestation was as a result of the unique type manifestation technique. However, he also heard that her manifestation was identical to the founder of the Norville family. Which meant that her manifestation probably didn't stray too far from what was provided by the Singularity type technique.