I've always believed that BCoB gear was worn by security personnel in the Allagan Empire and on the Ragnarok ships for all of the physical damage dealings sets, and then the caster and healer set was worn by science and medical personnel. These sets for the most part are what could be compared to the common soldier in the Garlean Empire, and the Centurion. On board the lowest tier of the IC-xx ships (more on that soon).
Next, the HA sets are of course for those in a higher social status, station or position. Found in the Neurolink because of the nature of the contents on board, and found in the IC-xx beneath that had clearly more advanced things on board than the original one we was on.
Lastly, Dreadwyrm as far as I'm concerned has nothing to do with Allagan stuff and was just there for kicks and so people can pretend to be Meracydian.
I am also very curious if they were stationed during the Allagan era, with the structure design and everything, it seems that they might just have been. Could also just be that they weren't and the walkways, elevator stuff etc etc was for when they were grounded before heading to Dalamud.
They were maybe created for Dalamud, but they never were a part of it (built in part I mean), and were in fact docked. Hinted at by the sightseeing log entry for Helix, now, whether it literally means the Ragnarok could dock at Helix or whether it was just a comparative size to say how big Helix is and how capable I don't know,either way it suggested that a Ragnarok can in fact be docked.
As for what Dalamud consisted of, you forgot the Neurolink structure found in North Shroud, which if compared to similar designs found in the Fractal end area, were colossal rings that went around the entire inside of Dalamud. Most bizarre about these is that they housed actual bioweapons and weren't just a multi-part neurolink like those found on Twintania and other Meracydian slaves. They also had connected links and bulkheads connected to a Ragnarok.
The Ragnarok ships each had a designation, IC-xx with the xx being the number for example IC-06, they also each seemingly had a purpose, function and design. The first we scale in T2 and then eventually enter and travel down in T3 and T4, and then walk across to the terminal teleporter after T5 (the thing jutting out of the hand) was one of the big sword-like ones. The one beneath or perhaps linked to the Neurolink isn't seen, nor is the FCoB ship (IC-06)... however, I believe the SCoB one beneath or linked to the Neurolink is one shaped like the walking stick, and the FCoB one is likely another of the straight design.
The biggest mystery though is IC-06 (the FCoB one) has a regeneration grid that is a replica of Dalamud. This structure houses IC-xx control for each of what I suspect are the Ragnarok ships stationed on Dalamud, the entire structure itself shows us exactly how they were placed on Dalamud, how Dalamud is created block by block (just like the Fractal Continuum) and it also shows us many different types of Ragnarok. The mystery is, was this thing a part of Dalamud, or was it in fact a thing on the planet itself that had access to all of the IC-xx controls, as well as Core Override and Coil control.
And one last mystery of the Ragnarok, Louisoix mentions they were digging and constantly searching, once we emerge in T5, we see that the bottom part of a Ragnarok has detached and gone across to the other side of that cavern, which is then after reaching the terminal revealed to be the main bridge. Does this mean any Ragnarok can detach the main bridge, or is this simply how it digs, by shedding parts of the structure and then they proceed to burrow through terrain...
Sorry, I could go on for years about these damned ships, they fascinate me... as does all Allagan related things. I wish there was more info on this stuff, especially the Ragnarok ships.
Oh, and there's still one in very weird to be ignored territory, the one at Boulder Downs... Ishgard were surely aware that Allag had dragon controlling devices... yet this one is unexplored, but then, perhaps they couldn't access it much like we couldn't some others.
Regarding the SToQ and the surrounding area.
Maybe... an earthquake was that Calamity (could entirely be the Great Flood, makes more sense?) what with the area having copious sunken structures and gaping tears through it, hinting that this might have once been an Allagan city as them ruins do have common architecture with those in Mor Dhona. Or a sea of lush plains could perhaps sustain a race of "tree-like beings" that could have built it before they got there?According to the Sons of Saint Coinach, the Sagolii Desert was once a verdant sea of lush plains capable of sustaining great civilizations, as is evidenced by the ruins recently discovered in the area. How such a place devolved into a lifeless desert remains a mystery, but recent disaster tells us an ancient Calamity is likely the culprit.
Please people, stop using this node as confirmation of anything, as it is entirely dependent on what race you are over what it says is next to be hunted.
And if this is the case, we can also say Garlean's existed in the Allagan era, as another node has "detected Garlean forces" over in Gamma.