This shouldn't be a TSA issue - it should be between CO and LA World Airports Authority. TSA has no jurisdiction to decide how the lines are managed downstairs - they do what LAWA tells them to, and LAWA determines policy based on what it worked out with the leaseholders (airlines).

If anyone is passing through the airport, ask the counter staff for the Station Manager's email address - drop them a note and ask if they are aware of, and authorized the security line changes at the 6x concourse.

They may not even know of the change or be aware of the impact - and they are the best contact to either tell you why it was done or escalate it if it was not authorized.

I had great success working with the super Station Manager at FLL to improve the Elite Access experience at security - I'm sure the LAX SM will be just as helpful.