>>26623342Because the Japanese name for the Substitute doll is Whimsicott's Substitute.
If you really want a Whimsicott plush, find the Whimsicott MPC or the Whimsicott Type Focus plush. I recommend searching Yahoo! Japan auctions and getting a good deputy service such as Noppin or From Japan. Good luck, anon. Finding decent Whimsicott merch is no easy task.