Was the (resolved) Chicago teachers' strike all about Rahm?

Up front, I haven't followed much of it save for the national news snips. So I don't know the local details. But what I've seen reported from both sides is all about teachers v Rahm. Was this Chicago politics played large? Or a basic contractual dispute?

Strikes are typically focused on specifics. The press has slid by some of the specifics to focus on the drama.