They are going a little too safe. Maybe they were just the right members for the theme of the song. Timing in "The Great Nogi Plan" to rule everything. Dunno.
Unlike AKB, I feel current Nogi46 has the fantastic problem of having too many high potential girls.
Any particular member/s you want to see get a chance at center?
It is safe for Nogi menegement, they are the most popular members right now but (just like you said) they've got many charismatic girls who never got the chance to shine. For example Kazumin, she is really capable of taking center position. She is intelligent, funny and pretty so center would be a piece of cake for her
I know well-known face sells better but when Nishino and Shiraishi will graduate (I HOPE it will not be during my lifetime
) Nogizaka may just be coursed like AKB, without any ace or girl aspiring to become one.