Buddhism and Integrative Complexity
While I don't have any comments on the individual concepts of Differentiation and Integration, reading that wikipedia article about Integrative Complexity as a style of thinking - strikes me as being very similar to the &quot;Buddha can see from all perspectives&quot; idea I presented in my answer here.
Quoting the wikipedia:

Integrative Complexity is ...recognition and integration of multiple perspectives and possibilities and their interrelated contingencies.
For example, it could take the form of explaining why someone may view an event in a different way or in what ways a compromise could be made between conflicting values.

So by this definition Buddha is the champion of Integrative Complexity.
That said, these parts:

Integratively complex thinkers are also more prone to defer to others or put off making a decision when faced with difficult cost–benefit decisions.

and

Additionally, while integratively complex thinkers are more likely to reach a mutually advantageous compromise when dealing with reasonable opponents, unreasonable opponents are much more likely to be able to exploit them.

-- do not sound relevant at all. Perhaps whoever wrote this did not realize that one's ability to integrate diff. perspectives does not preclude one from having clear agenda. Buddha knows what is ultimately good (cessation of suffering!) and has no problem utilizing his Integrative Complexity skills to use people's own motives to their ultimate good.
So perhaps we could say that Buddha is the champion of Integrative Complexity AND ethics.