Oddly...
I've just stood inside the bahro stone's rock while debugging the physicals!!! in MOULa.
So it's there! Where there's a stand to hold something, there MUST be the thing to stand over it (aka the Descent Bahro Stone!)
...ohh I almost forgot... on Deep Island shard, the above-mentionned stand is there and hold...the Descent Bahro Stone
EDIT:
After visiting the original location of the stone, I went to the "new" location
If you can debug the physicals, go at the end of the Tokotah Alley, you'll laugh. They, Cyan, came with an "artistic" solution. They inserted the Descent Bahro Stone (nearly 75% of it) inside the collisions surrounding the ruins around.
So...with just 2 little physicals debugs, I proved that the Descent Bahro Stone MIGHT not be anymore in Gahreesen file BUT SHOULD HAVE ALWAYS REMAINED in Gahreesen since the beginning. Cyan just did a work-around badly designed to fit the "Leap of faith" we had in URU CC.