I have also made distinctions on this site between the first Yang style I studied and the YCF transmission I am studying now.
This may be part of your confusion.
The first Yang style I studied had some elements in it that are not present in the YCF tradition, though they were present in the Wu style I learned later.
The differences are: frame size (large, medium or small) and weight distribution between your legs.
The first Yang style I learned our instructor simply called "Traditional Yang Style". The instructor never mentioned which Yang style, never said anything about lineage, any of that, so I have no true idea what it may have been.
The "frame" was nowhere near as "large" as the YCF style I'm currently learning, but was larger than the Wu style I have studied since then. Seventeen years after I trained in this style I have no way to know which Yang family member that transmission came from. Though my brother, who trained this style with me (now a disciple of Sifu Wu Kwong Yu), believes that it was the medium frame and may have come down from a student of Yang Jianhou, who is the only Yang family member who is listed anyplace we can find who specialized in the "medium" frame.
Again, no way to know, that is simply a guess on our part, though based on research into the form names (my wife actually saved her form list, she trained that style with us and she's a a pack rat, came in handy this time though) and the fact that it was a 108 posture long form with a smaller overall "frame" than YCF style TCC but a larger one than Wu style.
This "traditional" Yang style also emphasized what we have here come to call 100/0 weight seperation between the legs during the forms, push hands exercises, applications training and free style sparring.
I still call this "traditional" Yang style, as I have seen this same form called by this name in many, many places. The form is out there and many people use it. I know of no other name to call it so I use that name, though I do not believe it has any more "tradition" to it than does YCF style.
Then I spent twelve years taking instruction under Sifu Wu Kwong Yu. The Wu family transmission comes down from Yang Banhou and Yang Lu Chan, the origins of which are recorded in many places so I will not bore you with them here.
The Wu family style is most definitely small circle and small frame style TCC, and uses the same 100/0 weight seperation as the first "traditional" Yang style I learned throughout the form with a few exceptions when it is 50/50. I continue to train their transmission of TCC to this day, though distance has made it impossible to train with any other Wu stylists.
This lack of training partners and my subsequent loss of skill (you try to go five years without pushing hands and see if you're still good at it) lead me to the only people in my area practicing ANY kind of legitimate TCC (I won't go into that here, I've whined about the fakes too many other places on this board) and that is YCF style TCC.
Fortunately my instructor is an excellent teacher with a fantastic sense of humor about inheriting this problem child of Wu Kwong Yu's (Yes, Eddie, you created a monster!) who is constantly going on about the strange weight distributions in YCF style, the "giving back" of weight to make a transitional move (which I have proven over and over and over again is completely unnecessary, though I do practice them that way to keep his head from exploding AND to keep the YCF transmission pure, you see I am a traditionalist after all!) and who seemingly cannot bring himself to get his body into large frame no matter how hard he tries.
I believe the distinction between "traditional" Yang style and the YCF transmission is that late in his life YCF altered his families "traditional" forms to reflect what he believed was a better form for everyone.
Some say it is inferior, others that it is the single best improvement to TCC since Yang Lu Chan learned from the Chen family.
I say that if Wu Chien Chuan can take what he learned from his father and Yang Ban Hou and make his "square form" and no one complained or said he was "cheapening" TCC, then why couldn't Yang Cheng Fu take his families form (same exact form, they both learned from Ban Hou after all, they both taught that exact same Yang family form together in the same school) and make it better?
Makes no sense to me.
Cheng Fu, after all, was the lineage holder of the family form. If he wanted to change it, I would say he certainly had more right to do so than Wu Chien Chuan did.
You now have "traditional" Yang style, the form before YCF improved his families style, (Yang Cheng Fu's earliest disciples and members of the Yang family who never trained with Cheng Fu still use this form to this day), and Yang Cheng Fu style TCC, the form he created and the YCF branch of the family (the one represented here) says he improved.
I dunno if there is a "better" here, just different.
I have learned both of them, though I have not retained the entire 108 "traditional" form over the years. My wife actually remembers much more of the
"traditional" form than I do (she didn't train Wu style after she learned it). With her help and the knowledge I am gaining from the YCF forms, I have been working on trying to recreate this form for myself.
Not having much luck, but I'm stubborn. I may find a tape someplace if I can get one that has some claim to legitimacy and see if I can't get myself versant on that form again.
That's all I know about the questions you ask on "traditional" vs. YCF Yang styles.
Hope this has been informative for you.