I was hoping I was wrong, especially because at the time, Dixie and King Boo made more sense anyway (And still surprised they're not in the DLC line-up; now we're getting Fur Suit clones of characters who are already Babies and T-1000's? They're only bringing back Dry Bowser?), but I did the math. Mario Kart Wii was the biggest MK roster ever, at 25. The Koopalings alone are almost 1/3 of that roster. and we knew by that point that all 4 Babies were back.
Plus, between the Babies and Koopalings, the races had 12 racers each, so I also realized that you're bound to see at least 3 of that lot per race... I'm hoping people like Diddy, Birdo, Jr., and Dry Bones are interspersed along with this current DLC season, maybe with some cool newcomers too like K. Rool or Mona (Seriously. As soon as I saw MK Wii had bikes, I thought she was a shoo-in. 5 Babies, 12 Turtles, and 4 Power-Up Clones later...)