Went to the Isle of the Watchers just now and activated as many Owl of the Watcher statues as I could, activating 7/9 before I could not continue. Here is the order I activated them in and their co-ordinates.
1. 43.29, 85.29
2. 37.10, 82.19
3. 44.25, 72.45
4. 40.54, 75.19
5. 50.46, 91.67
6. 40.56, 75.13
7. 47.44, 84.62
?? 46.07, 84.04
?? 43.68, 87.44
46.07, 84.04 Owl is registering as useable and I can cast the effect, but it says "You can't do that yet." I don't remember previously activating it before today, but that is a possibility.
43.68, 87.44 Owl on the other hand isn't registering at all except to the macro given previously in the thread. It's possible that it's a phasing issue perhaps to do with Warden reputation (I am only barely Honored at 575/12000).
Think it's possible that the Wardens will be the breadcrumb quest here, possibly upon activating the last owl statue. Would like to see if others are able to activate the statues in any other order and if they're able to activate the ones I couldn't. Could be completely unrelated, but would note that the Owl of the Watcher objects are listed as Quest related objects on Wowhead without any associated quest, which is a strong indicator there's SOMETHING hidden about them.
This would also tie into the previous hint of the Vault having secrets or something, maybe once you have the breadcrumb you are able to loot the bindings from Ash'golm?
Thanks
EDIT: Returned shortly after writing this post to be able to activate 43.68, 87.44 as the 8th owl. 46.07, 84.04 Owl is not successfully completing the cast however. Will update again if anything else happens.