Mikogami has Mutsu and of course Akitsu for now. I'm sure down the road she'll be cast aside...
I would say Higa is more of a quantity over quality in the lines of his Sekirei. Controlling seems his trait rather then use of force...
The number 7, hmm. I would say it could be Akitsu, but why give her a number when she was just a guinea pig from the start? Then again Minato does need her to complete his set, so she probably is #7...
