One other additional comment is that baji, at higher levels, the horse stance used in postures changes to a stance we call half horse/half bow. You find this in liu da kai usually the other forms except for xiao baji jia. In xiao baji jia the horse stance is always employed.
"Its better to build bridges rather than dig holes but occasionally you have to dig a few holes to build the foundation of a strong bridge."
"Traditional Northern Chinese Martial Arts are all Sons of the Same Mother," Liu Yun Qiao