That’s only about BM and her potential so it doesn’t mean the top CP0 member is admiral/fleet admiral level.
Caramel said she had the potential to be the best shield celestial dragon could ask for, while she *only* said BM had the potential to be admiral or fleet admiral, but not the best element navy could ever have. To me this clearly means that the top of Navy > top of CP. Maybe the strongest CP0 member is as strong as the weakest admiral