JR is right on. Some folks just won't have the pond facility or the techniques to develop the body, or bulk it up and fill it out to its potential.
The traditional Matsunosuke style body was primarily associated with the Sanke. There are new versions of the Matsunosuke frame these days. Though some of us don't like that "look", we have to keep in mind that it does come with a benefit package. The Koi with this frame that do bulk up and fill out as adults look absolutely incredible in person, AND even the females that don't get bulked up never show a heavy belly or egg pouch even into old age. The body stays shapely.
Best Wishes,
Brady Brandwood
