Board Thread:General Discussion/@comment-37364794-20190203224807/@comment-29800728-20190211131531

You know what, I've just checked it out and you're right. He does have an emblem on his shoulder armour at the end.

Well since for the majority of Season 6 and the entirety of Season 7 he does not have one. I think we can just assume that it was an error on RT's part and they just forgot to remove it before filming those scenes.