It's not at all unusual for November releases to sell more copies in December. I'm not sure why to think SMG would be one that doesn't. I thought Mario games were particularly strong around the holidays.
To pick something related in series/genre/publisher/scheduling, last year Yoshi's Island DS released on November 13. December sales were nearly triple November sales.
2
To pick something related in series/genre/publisher/scheduling, last year Yoshi's Island DS released on November 13. December sales were nearly triple November sales.