Possible scrapped Highmountain raid?

I believe there may have been more the the Highmountain story that might have been a whole raid scrapped in deveolpment.http://ift.tt/2tLhBQ2 image is an instance portal just west of Neltharion's lair portal in Highmountain. It used to be an old model green portal, which were always raid portals. It has since been changed or I might have been mistaken but it is a portal none the less, which leads nowhere. This is not all however because the biggest piece of evidence comes from the Paladin order hall.http://ift.tt/2v89nF9 is an image of the mission board in the Paladin order hall. If you look close, you can see there are crosses marked on the map depicting the location of the different raids, ToS, Nighthold, EM, Trial is a bit north but Ill let it count. But then there's one quite close to where the portal is located in Highmountain, but the map isn't a good map of the finished one so it isn't exact. This could of course be the dungeon but I wouldn't see the point in that. I believe that this map shows all the raids in Legion before 7.3 and I believe they made this map before the other order halls. They scrapped the raid in early development because there were other things that needed to be finished and they never bothered to change the mission board.I could be completely wrong of course, that's the fun in speculation :D. If there is anything to add or completely ruin this then please tell comment.