On a somewhat related topic, having been arranging the colored MUSCLEs by parts and trees over the past couple weeks, I have to say I am still completely perplexed.
For instance, there are several Kinnikuman parts that are divided into two trees. Including the Non-MUSCLE sculpts, these parts have 10 and 12 sculpts. However, since one of the sculpts in each part is a Non-MUSCLE sculpt, the two trees break down as 6 and 5, or 5 and 4.
This leads one to believe there is a good reason why one of the sculpts was left out. Because, why arbitrarily turn one entire tree of sculpts into MUSCLEs, but leave one sculpt out of the other tree in the part?
In other words, why not make two trees of 5 or two trees of 6 into MUSCLEs?
It's very tempting to say that one of the molds must have been damaged. However, part 13, which consists of 12 kinnikuman sculpts, is missing one effing sculpt -- a perfectly cool Geronimo sculpt.
So, instead of making
the two trees of 6 and 6, they made a tree of 6 and a tree of five. What's more, the Geronimo mold does not seem to have been broken as new figures made from the sculpt were re-issued in 1998.

Were the Re-issued figured made of a new plastic? Is there any chance that the re-issued figures were simply left-over kinkeshi? If so, there would be the possibility that the Non-MUSCLE sculpt molds were indeed broken.
If not, what would lead Bandai/Mattel to, in seemingly random fashion, leave 1 to 2 sculpts out of certain parts? (Keep in mind that some parts had all the figures made into MUSCLEs.)
Some parts have 3 trees and 1 Non-MUSCLE sculpt, some have 2 trees and 3 Non-MUSCLE sculpts. There does not appear to be any rhyme or reason.
Barring the three Brocken sculpts, the Non-MUSCLE sculpts are interesting, unique, and seemingly no different than the MUSCLE sculpts. (I've attached an image showing all of them from parts 1-21 below.)
Edited by Soupie, 22 April 2006 - 03:30 PM.