I think it is some sort of automated statistical analysis and there is a pattern to it and the pattern is filing date of I-485.
What puzzles me is why I-140 and I-131 and not I-485?
MY POSSIBLE EXPLANATIONS
They may lining up cases for pre-adjudication???
They may be assigning unused visa #s to these cases???
Namechecks/FBI FP data was uploaded to the applicant file, but when one goes for FP I-485 gets the LUD and not I-140 and I-131???
They may have assigned visa to all these applications during the July fiasco and now returning them as applications are not ready for final adjudication???
or
They are just playing with us.
USCIS is a mystery................... Only God and inside people will know what it is...............
Does anyone know whether I-140 application files stay separate or combined with I-485 even if they are filed non-concurrent? As this may explain LUD on I-140 and I-131.
I have read somewhere that I-765 is separated from The I-485/I-131/1-765 packages for processing at TSC (and that is why there is no LUD on I-765) and thus a random I-131 LUD may be tied up to I-485 but then why LUD on I-140 and why not directly on I-485.