Unless you have a need to connect wired computers to the CGN3, there is probably little benefit leaving it in gateway mode. Even simple things such as port forwarding are done without issue on third party routers. If there is something specific you need to do, in order to make a device or application connect with the outside world, run a test in your current configuration versus bridged CGN3 and Apple Extreme base station behind it. That will really tell you what configuration you need to run.
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