User blog comment:Xilinoc/Ch. 543 - Letters/@comment-8669536-20130626135749/@comment-2211792-20130626155918

@ColJazzman >>Also that Quincy with the beard who was watching I don't think he is in the Stern Ritter team, but I do believe he has a letter like Quilge who was in a different group.

That guy was the one who mind-controlled Jidanbo (see chapter 500, you can see someone doing the "geh geh geh" laugh as Jidanbo smashes the building). Since only Stern Ritters participated in the invasion, the "onlooker" has to be one, too.

@Sternritter M >>I do wonder about many of the Stern Ritters and their names. I thought some of the Arrancar names were "creative", but Mask De Masculine?

Probably a stage name. Unless he isn't a real luchador, but just a wannabe.