I don't think it's that specific, and I was only referring to the level of power or rank in the espada. Also, I believe a NORMAL hollow's hole is in its chest. So anyone that's not particularly special would probably have a generic place as well. The only ones I remember are Grimmjow's abdomen, Ulqu's Neck, and Stark is right beneath that with one in his sternum or just below the remnant of his mask. Even if I guess Yammy's is in his chest, he and that fishbowl head are weakest, so that doesnt' really surprise me. If Nnoitara's is somewhere between the sternum and abdomen, I'll look into it more.