My understanding is that there are degrees of fragmentation. In the way I see it, any mental illness could be viewed in terms of degree of fragmentation. Depression and anxiety could be cracks or holes. At the other extreme, where the ego is fractured into separate pieces, that are not necessarily aware of each other or able to work together, is DID. Psychotic disorders might also be an extreme fragmentation. I see myself somewhere in the middle, as I am fractured into split off pieces that don't like each other very well but still recognize each other as part of the same unit, with the same memory and experience. Of course, if a rock is thrown hard enough to fracture it, the same rock could also have holes and cracks all over it too, so there may be a lot of overlap between the degrees of fragmentation. That's how I see it anyway.