I've seen so many listings on other sites where people are selling bg pocket nappies (the ones you stuff with the insert) as all in one, the all in ones dont need any stuffing as they have no pocket although some aio's have a pocket for extra boosting, and already have the absorbant bit in them, basically if it has the absorbant stuff inside that you cant remove then it's an aio. Bumgenius also have other versions of their pocket and aio nappy e.g. v2 and now v4, they are the same thing but updated or older etc, although there really wasnt much difference between the pocket v2 and v3 apart from the larger pocket opening.
You can get all in ones as birth to potty (one size) I think bumgenius do these too but dont quote me on it
Have I confused you even more?