Ya, I think Bahamut design should look more like a Stand or Persona, emitting from the back of the user, based around the size of the user, and when you use their ultimate attack they could show the design we see now much like how Hellfrog Medium is an in and out animation. Sure it's big but it's there for a split second, not a target and goes away quick. Bahamut's "ultimate" abilities could use that model in a similar fashion.