If you stick to your current itinerary and just go to Osaka, then this package is cheaper than buying a JR Pass.
Why Osaka for a day? For universal studio? Just to stay for the day is a bit strange if I'm honest. In two weeks you can see a lot more - sure Tokyo has enough to occupy you if you want, but at least visit Kyoto for 2-3 nights (or more) while you are down that way. Unless you hate shrines and stuff, which perhaps you do (I know a few people who pass out from boredom...)
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