Well, there's no "official" subleader.
As I think of the last shot of the "Come Together" concert where IY give each other a final high-five.
Which, going into IshiYoshi world, does bring up an interesting thought: there couldn't be a realistic subleader for OG if it
wasn't Rika. Well, except
maybe Mai. (If she even wanted it.)
Besides, wasn't OG formed when R was still in V-U-Den? (It probably quickly reminded her of what it was like to have
fun in a singing group again!)
But if R had become sub of OG, AND was in H&A with Y, there would be NO STOP to the lesbian rumors.
Just like if R had stayed in MM and Y ended up being
her subleader...