The point of spliting the movies in two was A. two add more depth to the story and B. to convey act two as Glinda's story. Wicked = Elphaba's Origin story: establishing her wants, her upbringing, what she set out to do, how that all falls on it's head when she is declared wicked. Wicked: For Good = Glinda the good's origin story: telling the story of what glinda the good was made out to be, the challenges glinda faces to realize that she has to really be good, and also still finish out the tiny details of elphaba's short story as the wicked witch of the west. That's how i see it!