score:3
Really interesting question....
I went through about 8 sources. There are a lot of cool sources on how Chicago laid out it's north south east and west grids around the epicenter of State and Madison Streets in the heart of the Loop. I used to live off of Erie right across from the Playboy skyscraper. I ultimately had to google map the intersections you were talking about so I could visualize the question.
The answer is between 1909 and 1911 as Chicago tried to standardize addresses and street blocks, they also tried to standardize street names. This meant consolidating 100's of street names. Only they weren't consistent. Older better established parts of the city closer to the lake were more successful in resisting the name changes than were the more recently settled western parts of the city.