System to me is a way to teach martial art, a martial art exist in the practitioner or master himself and is very individual. Perhaps this idea comes from my sifu, I do not know, since he is very much in approval of studying or learning other systems as well.
I share this view as well. When we start out, our WC is going to be a carbon copy of our teacher's, for the most part.
But as we develop and learn more of the system, what we do should be our WC.
The over arching ideas , principles or concepts or whatever you want to call them will still be there , but it will have each individual's distinct flavor .
At least it should. We shouldn't look like little WC robots running around mimicking movements, trying desperately to fit WC techniques into our arsenal. WC is not a style of kung fu, it is a system.
And as such once it's understood, the principles of the system do not restrict you they free you up. WC doesn't teach us what moves to do, it teaches us how to move.