I guess the FF XIII event ++ boss is the new barometer for BS in the game? I would be shocked if it was viable without using the Taunt method. Maybe with a full 60+ party and mutiple FF XIII gears (which are pretty rare to begin with). I squeaked by a win, but it was extremely frustrating and highly dependent on it not using its magic attacks often.
This event definitely has a clear distinction between people who got a Blazefire and those who didn't, just because of the lacking synergy sword from rewards like I mentioned at the top of this page coupled with how far Advance/Ret stands above other overall setups at this point of the game.
I'm in the lucky-unlucky camp where I have two (lol) XIII rods and a Kaiser Knuckle. Zero XIII defensive items other than the reward Titanium Bangle+ and a grand total of 1 5* Robe/Armor means I'm going to have to defensively RW. After XP daily I might try a 2-mage-Blizzaga setup just for variety. Napkin maths suggests that I'll be able to clear it pretty comfortably, but like you said, 2 rods for XIII is pretty rare to begin with.
(Before you ask, no, Tyro with the Kaiser Knuckle barely has 10 ATK more than Cloud with Zantetsuken, with far shittier HP/RES, so that's a shitty alternative for retaliate)
Should be more interesting than the cookie cutter Retaliate strategies, at least.