Board Thread:General Discussion/@comment-3422208-20140914021318/@comment-18753817-20140914022234

Because

1. The statement concerning the Sternriiter having Captain level spiritual power only applies to those seen in the 1st invasion and

2. Well this is a quote from Xilinoc " We base it off their performance in combat, and given that Meninas and Candice were attacking a severely weakened Kenpachi with his eyepatch on, Liltotto just killed some unseated Shinigami, Giselle forced unseated Shinigami to kill themselves, and all four were utterly overpowered by Ichigo (read: basically the strongest character in the manga right now) in chapter 582, there's really not enough to draw a conclusion about their power level from at this point in time."