User blog comment:Xilinoc/Ch. 599 - Too Early To Win, Too Late To Know/@comment-6904925-20141002173154/@comment-11051098-20141002182552

It would make sense, unless Kubo made a mistake.

"Promoted" could simply be a choice of words, it doesn't need to have any particular meaning.

But, as you're on the topic:

When Shaz introduced himself, he said he was "the Sternritter Shaz Domino". He didn't say "Sternritter (letter)". This got me thinking - what if there are Sternritters who doesn't have any special ability that requires a letter? Or simply more Sternritters than letters, and Yhwach didn't want/bother to give the same letters to more than one person.

Either way, that could be a possibility, as it would make Unnamed Sternritter N, leaving Shaz as a letter-less Sternritter.