I'm not sure that I agree with Kay McClelland. The Gabby/Stine relationship provides much of the drive of Act Two. Gabby has the dazzling "It Needs Work," which only suffers because "You Can Always Count on Me" was even more dazzling and staged brilliantly. And in a show with a lot of characters, locations and plot, I think the balance couldn't have been swayed any more toward her character than it already is.
Incidentally, while I appreciate the irony of the show's title, I always rather liked the show's original title, Double Exposure, which I think is more descriptive of what the show is about.
Begin at the beginning and go on till you come to the end: then stop.