User blog comment:Arachne sama/Ch. 500 Jidanbou and Rin acting strange mystery/@comment-1586993-20130609024240/@comment-8051005-20130609155716

Ha! This is awesome, I knew someone would definitely have better visual memory! Of course, this is just a theory, but I have a gut feeling a theory like this one might end up being closer to the truth than the obviously simpler explanation of that being another Quincy.

The reason I actually brought this up is because the attack on Research & Development somehow felt different in presentation from the rest of the Quincy assault on Soul Society - with all the arriving Quincy guys getting some 'screen time' with their appearance and skills. The manner of story-telling here feels similar to the implied mystery apparition of Grimmjow? at Urahara's location in Hueco Mundo - with only a part of a torso revealed, etc.