@LauraRbnsn To clarify, The Scarecrow becomes incompetent. The Tin Woodman (suddenly called Nick Chopper for some reason) becomes obsessed with his looks and shining his tin.
@LauraRbnsn In the book, Dorothy has no idea that the water would kill the witch. She was just angry that her shoe was stolen.
But if Dorothy + Scarecrow + The Tin Woodman came to kill, I would expect Elphaba would not care.
But that is assuming some continuity between the stories.