As the final leg in its story, Bleach's TYBW arc is packed full of new Bankai — one of which is even stronger than Ichigo's ...

Some of the strongest Bleach siblings happen to be Soul Reapers ... Ho and Ban were smug and arrogant, and they enjoyed killing people from afar. Like other Bount, Ho an Ban possessed a Doll.

It seems that Bleach author Tite Kubo intentionally meant for the title of the strongest Espada to be vague and left open to interpretation in order to spark debate. Three characters, namely Starrk.