User blog:SaxyAndIKnowIt/Sui Feng's Shikai and Bankai. What's the similarity?

Okay, it says that no Zanpakuto's Shikai and Bankai have unrelated abilities, so what about Sui Feng's? There's an obvious difference. Suzumebachi is tiny, discreet, accurate, and can kill in two strikes. Jakuho Raikoben, however, is a giant, bulky, missile launcher that makes it hard to move, and the recoil is so powerful that she has to be anchored to a building with Ginjotan. Obviously, they're nothing alike, unless the fact that both of their attacks involves a forward motion, but I doubt that. Am I overlooking something?