These are pictures of one of the bendy metal strips they use to augment the normal steel cables that hold the crown truss in place tieing it to the back stays.
I think they tried repeatedly to get one of these in place on the northwest corner and failed. This was just after the last piece of box girder was installed in the northwest corner. Maybe they eventually got it put in place but I doubt it, since I saw them put it back in the Irving storage area and haven’t seen any progress on that part of the crown truss since. I think it might be why things aren’t moving forward with that section.
The bendy metal strips are much longer than the cables, and much thicker and stronger. They are longer than the spiral columns and are rigid enough to lie horizontal when placed on the ground. At least one spent time in the storage area on Irving before the failed installation attempt.