Whats silly is your continued misinterpretation.
Again, the law as written...
Does AMFA represent the mechanics at AA? No.
Does AMFA represent the mechanics at US? No.
By law for the exception to apply AMFA has to represent the craft and class "at each
of the covered air carriers" they do not therefor this exception does not apply. Simply winning on the new AA doesn't fulfill this requirement.
As to your comment about AMFA arbitrating against itself, why is it such an outlandish idea. The pilots union at AA/US APA is proposing a 3 way arbitration with USAPA-east & USAPA-west.
Its simply a CBA deferring a decisions concerning two groups it represents to a neutral party.
If it came to pass that AMFA wins at AA, and seniority has yet to be decided, why wouldn't they let the former TWU & IAM chosen reps make their case in front of a neutral arbitrator?