OK, after reading through this post I am betting I am about to get seriously flamed and although I like your diagram, and it is very likely I am misinterpreting it all together but I am looking at it and starting to feel you are over thinking this and getting lost in categorization. Also I will add I know pretty much zilch about your style so all I am about to say is based on what I know which is mostly CMA IMA.
I did much the same exact thing that you are doing in Xingyiquan and Taijiquan and, at least for me, I decided I was trying to over complicate it and categorize it into some thing I knew or understood, that made sense to me, but made no sense as it applied to either style, instead of trying to actually understand it and it was when I simply excepted the fact (in Xingyiquan) that I was a beginner with a lot to learn and stopped trying to over think it that things started to make more sense and I have to say it was rather amazing, since all I needed to do was relax and except what is. And with taiji when I just decided to the same exact thing was when things started to make sense, prior to that I had spent weeks trying to unify the 2 diagrams I first posted (The 13 postures diagram I was using was from Tung Ying Chieh and a little different than the one I posted, but that is my taiji lineage so that is what I used) trying to figure out a link between the 2 and how it could work in attack and defense and I finally asked my Taiji sifu and he said they are not the same since Taiji and Xingyi have different approaches to things and dont think to much about it eventually it will make sense. And he was absolutely right and that is when things got easier, not easy, just easier. I wasnt in a rush to learn things anymore there was less pressure (which I put on myself) and it got much more fun, but hard training was and is still required.
I am not saying that you should stop trying to figure things out things with your diagram, I think it is a good start, but there are 2 things in CMA that I first read in one of Bruce Lees books years ago (although I am pretty sure it was said by someone else before Lee sifu) that make a whole lot of sense. The goal should be simply to simplify and What is, is. Dont over complicate things, dont try and change them because they are what they are. IMO it is best to stop and simply study what you are learning as it is presented and it will eventually fall into place. I know I was very guilty of trying to rush things, over complicate things and getting upset with myself because it wasnt making sense for a long time, then I simply relaxed, went with the flow and accepted one other very important thing in real CMA training. My sifu knows better than I want I am ready to learn...
Keep at it but dont over complicate it just about all things in MA are interconnected and rather hard to categorize and separate. To quote (and take entirely out of context and bastardize) a completely unrelated movie
It is more of what you call guidelines than actual rules, welcome to Martial Arts, Miss Live True