The 100% bet has nothing to do with what is passed on to future generations. A snake that is het for clown will always have a 50% chance of passing that recessive gene on.

The 100% refers to what chance that snake has for carrying that recessive gene. So a 100% het for clown has a 100% chance of being het for clown. A 66% het clown has 66% chance for being her for clown. That means that there is a 44% chance that it is just a normal ball python. 100% hets or visual morphs are the fastest and most reliable way to produce visual recessives.

If you plan on working with recessive genetics (clown) I sugest you do some research on how they work. It is much more complicated than co-dom genetics like many ball python morphs.