Lack of aura makes it bland. Not that Nogi had a defined aura from the start. It was basically the push from members what they become as classy aura. Same with Keyaki on mysterious aura. And you hear members in Hinata keep using happy aura. No matter what kind of style they have they will always be true to their aura because members personality are part of it. AKB had genuine members from the start but most of them decided to graduate early on when the group peaked. Got replaced by pretty girls that basically just want the title and follow management's direction and has nothing to say. You need to have a vision that Sakamichi members have. Keyaki was supposed to be like any other idol group looking at Keyaki's 2015 yearbook. Aki-P lost the frilly and fluff image on AKB but wanted it on a new group because they were young and energetic. And you had Mayu Harada and the other girl (who left before the group debuted on TV). We can thank the members of what they become today.