User blog comment:Skitzo1/Now i see why Ichigo is part of the 5 special War potentials./@comment-3143776-20121010144708/@comment-4515326-20121011051840

I would consider Yoruichi to go alongside Kenpachi. She has never even used Shikai and is recognised as super powerful. But we can't tell because only Aizen, Ichigo and Kenpachi have been confirmed. Kisuke and Yoruichi would be a guess though