User blog comment:Hawkeye2701/Kubo Lost Count/@comment-7890302-20141112234220

I have only two explanations.

1. A fake image for Gremmy.

2. He was in actuality, Yawach's least favorite subordinate. So he decided to have Shaz go into battle, claiming he was a Sternritter so he would become the target for Captains.

1. Sounds more possible.