Double BRD as well.
However, this argument doesn't hold as much weight as you'd think. There's two criteria for LBs in A4S (at least when WF progression was a thing):
1. LB1 by the 3rd leg
3. LB3 by the 2nd sacrifice in the last phase
I can't find the video atm, but 2x WAR was done not long after the world first happened. DRK + WAR is simply better suited for progression in that fight, however, as DRK's mitigation is S+ for frequent magic damage. Totally doable, though.
e: Oh, yeah, and a lot of people didn't know about the sac strat outside of JP so doing it the intended way makes DRK + WAR even more favorable.