User blog comment:Hawkeye2701/Kubo Lost Count/@comment-5398287-20141109155813/@comment-1458758-20141110065733

Except Sternritter is a unique Rank within the Wandenreich who all have letters assigned by Yhwach with him as the only exception so far, and he was about to introduce his power before Ichigo shut him up, so it's quite likely, had he continued, he'd of revealed his letter and power anyway.