Expanding his Kings Will aura to create a barrier costs a lot of chakra as well as tires him greatly, a taijutsu user is also best used in this situation to attack Aizen so that he looses focus on emitting the barrier.
Expanding his Kings Will aura to create a barrier costs a lot of chakra as well as tires him greatly, a taijutsu user is also best used in this situation to attack Aizen so that he looses focus on emitting the barrier.