That's pretty interesting, actually. I've heard of aikido koshinage broken down into basically two categories as "head-through" or "hip-through" depending on what part of nage's body crosses uke's center line first.
Dan Hover wrote:
Koshinage's really break down into two types sankyo types and Shihonage types.
Both are possible. The grips break down into Sankyo Vs. Shihonage, the entry breaks down into head through or hip through. Although I feel head-through is easier to perform and easier to teach.