Think of Darius as a colony of an insular religious group (like the founders of Grayson) which was settled after a lot of searching and had to have several things beyone the normal range of requirements for planting a human colony.
You specificly would now want conditions such as a seriously Heavy world (no San Martine, or where Thandi was from). No requirement for serious terraforming.
You have to be off the beaten track, litteraly off the map in a place there is no record of anybody having gone before.
We suspect that the Alignmenet has it's own stellar explorer ships looking for wormholes and the capasity to explore any found. That would be the best -and probably the way- Darius was found and then developed.
The Alignment has lots of money and influence (even if not many know the exist) and has been planning for centuries to do this. So they would have figured out what they thought they would need to land and start a modern industrialized system on a newley discovered planet including what the basis of initial investigation and needed to look for as far as what was and wan't there and start creating lists at the same time as preliminary mapping was being done.
We know that the Alignment essentially created Manpower and Mesa as a front and the patsy for all the things the Alignment was doing that much of humanity- and certainly Beowulf- would object to. Like the genetic experimentation and modifications and so many other things. They -when we intilay start to see any real working of the Alignment in the books- have INTENDED to leave Mesa behind like a parasite exiting the body of the host it has been feeding off of for centuries and the host to die. Die probably badly since it will be the target of a lot of anger and other things as the League (as intended) disentergrates and trails will have been left to draw people and attention at Mesa as a source of problems. After the Alignment is vanished.
So, if they have been both looking for a safe, remote, secret location then they need to build what they need. They have thousand and thousands of people who are effectively citizens of a differnt planet than the public face of Mesa. They have genetics and biological labrtories on industrial scales and the information and ability to reproduce all that equipment and the vertical intergation of industries needed to build it and supply it- including with "staff", that being genetic slaves (who don't know they are slaves). They can manufacture what they need to start on (or in orbit above) Mesa or buy it almost anywhere. Did I mention they are rich? They have starships, including freighters and combination freighter/passenger ships and can move their people and materials on their own ships. They have TIME to build all the basic infrastructure, including agricultual base, to support many times the peope who are going to be there constructing the initial settlement. They can also do the same for the orbital infrastructure- buy or build what they need to start with inculding means to manufacture more in orbit and train the people they grow from the tube labs.
They have hyper-capable freighters, countergrav, prolong, start building with ceramacret from plans developed by architects and industrial planners with current softward and modern tech new scans of the areas they will be dealing with. And mostly nobody who goes to the Darius system is ever going to leave.
This is NOT loading up a colony ship and looking to build up from the limit of what and who you could bring with you. This is more like doing something the scale the Invasion of Normandy to plant a modern industrial "company city" both on the planet and in orbit and duplicate what it needs to grow. With more or less imediate access to any new tech or process or procedures that the Alignment can grab from anywhere including examples and the manuals.
So you give the non-Star lines perhaps a limited variation of Prolong and get 50 to 100 good working years out of your Labor Force people and your workforce gets better and better as it expands (litteraly pouring it out of a bottle). No political probems. No unions.
And on top of all of this you have the Star Lines and whatever next level people in full control and nobody interfering with what you are doing.
