[vezryl]

If I may add to this ^_^

As for the "holes" ya, Vasto Lordes will have them, because they're the "slots" in which the chains which bound them to life originally fitted in, all souls, hollows and so on have them.

And though it's not a main topic, on the subject of the Grand Fisher.
I believe that he is a menos adjuchas due to his unique abilities, the lowest form of hollow we've ever really seen to have those types are huge hollows, which if you look back are pretty easily handled by the shinigami. Now that on first view suggests he's a huge hollow, but as is explained he's been around for 50 years and causing the shinigami a lot of trouble, so if he's so tricky then the chances are he's a menos.

And for the arrancar.
I believe skin colour and so on are dismissed as not counting as human characteristics in something like this, because chances are the colours are just used artistically to reinforce people like Ulquiorra's personality characteristics, so in actuality he looks nearly completely human, just a little moroes.
I can't help but think that none of the Vasto Lordes have been discovered yet, simply because the power they'd have just doesn't seem proportional to the Espada.