Kraid appeared in two Metroid games. Kudgel and Klubba only appeared in one DK game, DKC2.
I'm more upset by how people are reacting to the leak than the leak itself. There's a few things going for it, but as far as I'm concerned, far more going against. The main problem is people commenting "Oh, this is a great roster!", "Donkey and Diddy represent the DK series just fine!", etc.
Plus the BS notion of, if this is fake, that not only does DK not have any newcomers at all, DK doesn't have a new stage either on 3DS, while Mario (yes its the big franchise) gets FOUR ****ing new stages. And if its real, its even WORSE, because it means Sakurai himself made that damn decision.
Kid Icarus can get a new stage PER version, so can Fire Emblem, but not DK? That's the most asinine thing I ever heard, whether the leak is legit or not.