For 4.2, the point is the '.copy()' versus the 'active_users' copy.  I think a real beginner would, or should, ignore any other details not immediately familiar.  

4.7.2 Keyword arguments.  It is simply a fact that including the full discussion here requires the forward references.  I think splitting the discussion and moving this part somewhere later would be worse.  Some will not be able to "follow the tutorial in sequence".  It is not a novel.

I think you should close this.  It makes observations but does not have any concrete suggestions for improvements, and unlike your other posts, I don't see that it might lead to any.