They are dragging the Aigami thing out way too much. All they have to do is make him unlockable too in the second raid duel along with Yugi. That way they could have done something else besides this useless roaming event.
I really hope you're right, that this is for roaming event only, and his actual unlock event will provide him with lots of Cubic drops.
Even Sera was consistent with her Cubic and Constellars. Why can't they be consistent with Aigami? His real drops and level up rewards should be focused on Cubic and Evilswarms only.