Hiya,
I feel you posted this knowing what the response and answer would be. In short, you really should separate your beardies.
First of all you mention that one of your dragons is a glass surfer - in my experience, Guacamole has only gone "Glass Surfing" when there is something wrong with his setup. When he started doing as a younger in his 20 gallon long, he stopped doing it when I put him in his 40 gallon setup - the tank was too small. When he started surfing again after I moved, he stopped once I was able to unpack all his hides and give him better than a minimal set up. When I changed his lighting, he did it again briefly before I got his temperatures right. Now he only glass surfs after he's pooped and before I clean it up, and I don't blame him, because yuk. While I understand that some beardies just DO THAT, to me glass surfing is always a sign of unhappiness/stress.
You also mention that they do display mild dominant behavior and that Druid hogs the UV. This is likely to be detrimental to AJs health in the long run.
On the topic of cohabiting in general... For bearded dragons, it is not ideal. That said, I have seen it done meh and very well on a couple of occasions that I will list here.
The meh version is at a reptile rescue I volunteer at every now and again when they are having big events and need spare hands on deck. If you're wondering why a reptile rescue has sub-optimal care for bearded dragons - one of the most common lizards - I feel I should add that they specialize in alligators and crocodile. The other reptiles they've acquired have been semi-accidental, and usually only when the reptiles had literally nowhere else to go. They have, last I checked, 5 beardies, 2 male and 3 female that are all kept in one huge 4 foot by 8 foot, open top enclosure. The walls of the enclosure are about 4 foot, and the beardies have a ton of platforms and vertical space. They also have three basking platforms and are right next to the check-in/check-out counter. They don't fight, as far as I have ever seen, however they do breed and the center simply freezes the resulting eggs. I have talked to the owner about this not being good for the females health, and last I knew they were looking into making a second enclosure similar to the first to keep the dragons divided by sex.
The well done co-housing was done by a breeder. All of his enclosures were 2 foot wide and 18 inches tall; male enclosures were 4 feet long and female enclosures 6 feet long. Male enclosures held one animal and were set up standard with a basking area on one end, etc. Female enclosures had the basking spot in the middle instead, and were large enough that without extreme aggression no one dragon could actually "hog" the entire thing. He kept his females in pairs, and if any single female proved to be too aggressive or failed to thrive in a co-housed setup for whatever reason, she was given a male-type setup. The female enclosures essentially had two cool ends with two food bowls, double the number of hides, etc, so that it would be very very difficult for one dragon to displace the other from the necessities. His animals were absolutely stunning, never so much as a toe missing except for one male who's tail got caught in a door and was missing about two inches as a result. Since his dragons were his livelihood, they were pretty much under constant observation.
So, if you are really considering cohousing these dragons permanently, there are several factors to consider.
First of all, what are the genders of your dragons? I would never co-house two males or a male and a female, but I might press my luck with two equally sized and docile females. Two males are invariably going to fight, even if given a massive set up - while the alligator sanctuary has two males in the same enclosure, I cannot stress enough how big of a mistake this is. A male and a female - even siblings - are invariably going to mate. This is bad for the health of the female if she is over bred, and obviously being full siblings genetic disorders would be at a premium. No one likes incest! If they are both female, there is a slight change you /might/ be able to get away with co housing your dragons.
The next thing to consider is the temperament of your dragons. Do they honestly "get along"? From what you say, it doesn't seem like they really do. One seems stressed (glass surfing), one hogs the UV (druid), and you say that they as juveniles display "mild forms of aggression" - these will only get worse as they mature. Because of this, I highly recommend you separate them.
Finally, consider the additional cost of cohousing two dragons. In order to do it right, you're going to need a massive, probably custom enclosure and almost everything you'd need for two enclosures anyway. All this, with no grantee that it will actually work out. You could since a few hundred dollars into making a good setup only to have it not work - the dragons start fighting anyway - and you need to put them in separate enclosures ultimately regardless.
In essence, what I am saying is that almost all people and their bearded dragons are going to be happier and healthier in separate enclosures. Can you co-house them? Sometimes, rarely, yes, but doing so successfully is unlikely to save you any money or space and puts your dragons at greater risk. I wouldn't do it unless you have a large number of dragons that you are breeding at your livelihood, checking in on them daily and monitoring their health like a hawk (Or if you're like kingofnobbys and are in a position where you can monitor them like a breeder would, haha!).
As a last note, one problem with co-housing besides aggression/competition is illness. If one dragon is sick, it's going to be harder to detect because the healthy dragon will still eat, poop, etc, and you might not catch on to the ill dragon being ill until it is in a significantly worse state. Additionally, being in the same enclosure, the sick dragon is very likely to infect the healthy dragon if this were to occur.
Hope this helps!
-Ellen