With those videos being all the way in Alpha, They don't really hold any truth any longer. Especially since Blizzard hasn't told us anything. Renown is like reputation. Sure, you could be working with them all expansion, but we didn't exactly see that with the AR in BFA or better yet, the ones in Legions tail end.
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Dont really think they are planning to use them. While I can make up a story on the spot for it, you also need for them to do that and for them to create a reason for the races of that realm to suddenly want to not only go to the mortal world, but to side with 1 faction and fight on that factions behalf.