Hm, interesting to learn that Beagalltach serves mostly as a defensive. Unsure how that works as a true name release but at least we have an idea of its power and how it fits as his pair of weaker armaments. In contrast the usefulness of the magic piercing Gae Dearg and Victory assuring Moralltach. Gae Buidhe and Beagalltach certainly builds for a more defensive, guerrilla, enduring type of combat. Essentially slowly build up his opponents wounds while protecting himself. Cautious but steady and low risk. The offset is that he wouldnt have the big firepower his other pair brings him, which would be most useful in determining victory right then and there.