Was reading somewhere that this figure went through many versions, updated as new features, where relevant, were introduced in Poser. Probably the weight mapping was tacked on at the end of the figures development. Not excusable in a commercial product, but considering that Poser, within the span of 2 iterations, has added significant features like GC, Weight Mapping, and SSS... maybe understandable. Poser, with its emphasis on figures, should have introduced these options way before it did.