User blog comment:QueensT1998/Could Ulqiorra beat Stark/@comment-1393830-20120913224104

Years after the chapter was released, people still don't understand what was said. Ulquiorra never said Aizen did not know about his second release, only that Aizen had never seen it. There is no reason to assume that the Espada rankings were wrong. Starrk was the second strongest Espada, Ulquiorra was the 5th. Assuming anything else is pure speculation and is not allowed on this site.