Actually.. I'm using exactly that comp with my Morgan setup. Obviously not cut for wrag, but can easily destroy trag.
To be precise: Morgan(Ambush), Titania AW, Cu, Odin, Cybele(U). Sounds pretty fucked up ordering, right? But Titania has the most consistent BG gain after the 1st cycle & since she buffs herself with her DATA buff, she has an easy time to gain (even more than) the necessary BG on the first cycle. Cybele(U) is on an odd place cycle-wise, I know. But my team is ready for burst in 3t like this almost guaranteed (Odin has to do 2x DA or 1x TA.. much more feasible than Cybele TAing once).
Oh, and since Sana proposed the silly idea of doing Crom with wind back then, I actually gave it a shot with that setup, except using Set instead of Odin (I dun have Gaia). To my surprise, I got to ~40% hp of Crom and that was with Crom deciding to triple Cu to death on her normal phase. Was a fun challenge, tho.