There are few exceptions to the general rule. It is much more likely that the exceptions were caused by hits (mainly during Late Heavy Bombardment),ok so imagine a coil that leaves the sun and passes all the way out into space. this coil touches every planet .
it is spinning and every planet touches this coil at different points. some planets touch the coil on top and spin one way, some touch the coil underneath and spin backwards, some touch the coil on the side and spin sideways.
so the first thing to do is reduce everything down to a simple process. and then see what is happeneing before starting to form a theory with assigned terms.