By the time we get spys from the GW we should be running scientis as will which will decrease odds. Realistically, only our 1st wonder will guarantee a cretin type of great person. After that it will be more random and up to the sorts of specialist we decide to run. Since we can directly run spies with a courthouse why don't we just plan to do that. CoL will get teched/traded fast in this game and since we plan to do a lot of expansion courthouses will be a high priority anyway. My point is - GW is a huge waste on the home island. On the big island it may have some merit - but that choice is too far off to consider.