I definitely recommend watching Buffy S05E03 'The Replacement' - Its a variation on the Star Trek theme as Xander is split in to two. But his two are 'competent and incompetent' rather **s***e and wimpy! Anyway, this episode always makes me feel better about integrating. The end result is that it was an unnatural state for Xander to be in two. The natural order wanted them to merge, and so it was easy to achieve - once they'd done the scary part of facing up to what happened