In my opinion it does not make sense if those systems are truly separate systems. Otherwise they are simply subsets of each other. In essence, when described like this the preying mantis, the taiji, and the baji are all subsets of longfist. Perhaps they are advanced aspects of longfist.
But I know that is not actually true.
I dunno, it just does not make sense to me. The system i train has its own method of developing basics and speed and power and rooting and application. If the system is trained properly then you get all of those things. It does not make sense to me to need to train one system before you can train a different system, if they are actually separate systems.
The interpretation of Grandmasters Liu's curriculum as needing to be learned in specific order has been translated as the only solid path by many of my colleagues. This however, does not make it a correct interpretation. There are others, including one from Liu himself. My Master, has said repeatedly that the reason these arts exist in our system is not to force one to learn them all, but rather to use the arts as hones to sharpen the different warriors needs. A true trainer of warriors talents lies in ascertaining the weakness and strengths of the candidate, and also the purpose of the candidate. I shall unpack this idea. This will perhaps illuminate the genius of GM Liu, and the subsequent high level of understanding his predecessors must attain to disseminate at the same level or preferably even higher. After all if the art does not EVOLVE it DEVOLVES there is no static in such things nothing is ever exactly the same as some purists would have you believe. First off, Liu had a sang that rings true and could even be extended, "All Northern Chinese Martial Arts are children of the same mother" and by extension, being of fighting Norman descent I would argue, All human combatives are descendant of the same father/ mother, but that assertion is a topic for another time. Liu was the product of many fathers of battle, most notably GGM LI, GGM GONG GGM DING, and General Zhang. each of these men specialized in teaching warriors. Liu used the subsequent arts mentioned above to fit the individuals needs. These arts are tools to hone the warrior not at all an absolute curriculum. If one were to learn all the arts and all the material taught under the system, (which not all were ever taught by Liu, I.E. the 6 substyles of Mantis disseminated by Su Y Chang, yet included in the curriculum) one would not have time to make war or to protect dignitaries, one would only be a scholar, an academic, and unless extremely talented likely not good at any of them. On the contrary, when teaching operators you must fashion a cure for weakness and an augmentation for strength from these wonderful styles. I for one came out of a northern longfist and Hung Fut background, and began Northern Mantis and Baji Quan immediately. My master having been very close to Liu for 8 years straight 7 days a week arriving at wake up and making him his last tea for bed learned the value of diagnosing a warriors needs. He subsequently honed me according to this amazing talent. Instead of going through Ba Bu Mantis first, which was standard, I was thrust into seven star and closed door mantis, three days a week, baji/pigua three days a week and spear and sword one day a week (Direct instruction). The mantis was to capitalize on my speed and small frame and ruthlessness, and the Baji was used to put a period at the end of my sentences. After several years it shifted to Mei Hua for fluidity and Bagua for mobility and accuracy. I learned Ba Bu and other mantis quite easily along the way having already conquered seven star. Being a Lifer, I had Time to dabble in Tai Ji especially Chens along the way, but my next prescription by my master was Liu He Mantis. This art he felt would place the finishing touches on my natural ability, and he rarely ever taught it because most could not make it work as a combative art due to its nature. It just so happened to fit my movements and became a capstone for me as an individual although there never really is a capstone. Now I have trained several disciples, and many professionals both LEO and MIL, they do not have the luxury of the life described above or the one my master or GM Liu lived. Therefore, I assess their knowledge through rapport building and providing basic movement training, within a short time I begin individual prescription of training. Using as little of each art as possible, I tailor the training using basics from any of the Wutang arts that I feel represent the best exercise for the needs of the student based on Lethal, Non lethal subduing or protecting, or health needs honed to the amount of intelligence, ability, or time the student presents as a canvas, or a work of art that simply needs tweaked. I hope this dissertation helps explain the actual intention of GM Liu's curriculum instead of being a pigeon holed purist perspective which would produce nothing but a vast wasteland of dancers, not combatants, it was a vast library of tools to sharpen a myriad of warriors with a myriad of intentions A true display of the genius of the Chinese aristocratic and educated mind.