I am responding in a general way to your question and subsequent comments. Though I am not sure how well defined "complexity" and "systems theory" really are, one philosopher who may interest you is Nicholas Luhmann. He develops a "systems-based" ontology in which his fundamental terms are System/Environment. He employs this largely in descriptions of social systems, and considered himself a "sociologist" in the broad manner of the Frankfurt School. He is a strict constructivist and his outlook seems to me not unlike Leibniz's monadology. Very interesting.
As another reference, the Nobel chemist I. Prigogine and the philosopher I. Stengers have collaborated on a number of books introducing the philosophical ramifications of chaos and complexity theory, most notably "Order Out of Chaos." These may be works that would help you get your bearings.
However, you seem to want "apply" complexity theories to philosophy itself. This would not be philosophy per se but perhaps "sociology of philosophy." Philosophy cannot treat itself scientifically because it is "historical." It retains and reinterprets its own history, its internal temporality. It cannot (with apologies to Logical Positivism and the Tractatus) redescribe itself in "timeless" mathematical equations or make "discoveries" that render prior texts useless. There are, of course, many books like Russell's "The Problems of Philosophy" that attempt to lay out "the essential issues."
On the other hand, if your aim is to look at the issue of "essence" in terms of "complexity" that may be interesting but is very broad. The reduction of "essence" or "substance" to some form of dynamic multiplicity is a huge theme in philosophy from Heraclitus to Badiou. But I am not sure about your equation of complexity to Aristotelian formal cause or whatever, so here I'll leave off. Not an answer, but helpful I hope.