It's almost certain that they brought her in because she worked in FAA legal, and likely because she authored the opinion. The best way to find "holes" in a legal structure is to hire the person that researched, understood, and directly authored something to try and close some of those holes. She should know exactly where & how sustainable legal arguments can be made.
This is common practice not only in DC, but also in every state capital across the nation.
Oh, the horror!