User blog comment:Njalm2/Fanon Canon - Grimmjow's Espada!/@comment-2089817-20150116144217/@comment-18812574-20150116171912

Yeah, however, since Grimmjow is the leader I think he would care about rank. (Not sure though). He would want to keep ranks below him in order to determine who is a threat, who isn't a threat, etc.