hey wait a minute..
it just now clicked to me, the transmog set got the name of
>Sargerei commander
When did the Sargerei first and ONLY time show up?
>WoD
and..
>one of the recoloured pieces got the name Lightbound
Aaaaaaaand when was the word Lightbound first shown up?
Why.. in BFA, in the AU Draenor Mag'har scenario.

This, this is the hint that Yrel is gonna return. It's been right under us this whole dang time