User blog comment:Xilinoc/Ch 649 - The Theatre Suicide SCENE 3/@comment-25897574-20151031024637

Here's how I see the Quincy OPness: it's all because of power source. All of the non Quincies use powers that they obtained through various methods (dying and insane training for the Shinigami, continually cannibalising each other for the Hollows/Arrancars, or receiving power from some other external source for everyone else) but in the end they're all mortal in one way or another with their powers connected to their own souls. The Quincies however got their powers from Yhwach who is the son of a God. Despite being mostly mortals themselves, the Quincy's powers are all connected to the soul of a (demi)God so it makes sense that they would be so much more powerful than their semi-mortal opponents.