Some of the strongest Bleach siblings happen to be Soul Reapers, and most of them are Lieutenant-level or higher.

It seems that Bleach author Tite Kubo intentionally ... Regardless of who the strongest Espada was, each Arrancar in this group embodied a certain aspect of human mortality, their abilities ...

He was also one of the strongest Arrancars in the series, despite his number. He is also the foil to Gotei 13’s Scientist, Mayuri Kurotsuchi. When his character is introduced in Bleach ...