I've replied to that thread with the assumption that pointing out critical flaws in the story would make you reconsider, not ignore them. This battlegroup makes about as much sense as making a KNF Bismarck and citing old Ku-Rh friendship as the basis. The earliest signs of any Li-Br alliance I am personally aware of is the treaty of Curacao from 817 AS, and that was already during the ignition of the Tau conflict.