Comparing KJ method grouping to clay
There is no "right way" to do this when you are trying to create new and interesting shapes by kneading clay.
Knead the clay to your heart's content, and if you can create new and interesting shapes, you have succeeded greatly.
If you fill an existing mold with clay, you will get a pretty shape, but not a new one.
---
This page is auto-translated from /nishio/KJ法のグループ化を粘土にたとえる using DeepL. If you looks something interesting but the auto-translated English is not good enough to understand it, feel free to let me know at @nishio_en. I'm very happy to spread my thought to non-Japanese readers.