User blog comment:B214/Volume 22 spoilers/@comment-30048084-20161031183100/@comment-24941352-20161114194728

I don´t think the Supremacy part about Ravel has anything to do with her strenght or about her thoughts. I guess it was more related to her smartness. If Issei listen´s more to her, he can reach higher aims and Ravel is atleast as smart as Sona. She is a great tactician, Riser didn´t listen so her, so her talents were wasted on him.