As you can tell, a lot of the members have been quitting because of lack of ideas or somewhat getting lost in the story...
But we also have another member gone, but it's due to the fact that she deleted her account.
So, now we need a new Sokou.
The reason I don't want a new Hachi, Kai, or so on is because the characters still technically belong to them and other members couldn't really capture the same adittude they would've had (well, they could, but it'd be hard to) if the characters were already involved.
Sokou wasn't really involved, so we need a new member for him

-Kyuubi no Yoko