Board Thread:Questions and Answers/@comment-36006024-20181107190534/@comment-29325824-20181112194426

Correction, Ulquiorra only said that nobody has ever seen his Segunda Etapa before, not that nobody knew about it. Huge difference.

Besides, even if his Segunda Etapa elevates his position, we still have no idea by what amount. It could be just equal to Harribel, it could be beyond Starrk, who knows. Since we have no confirmation at all we should just assume that Kubo meant what he wrote when he ranked them.