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JL fly every other airport pair between Tokyo and Osaka though - if you really wanted to fly JL why not go that way?
As for GK, their service is usually quite lovely. Weather can stuff up operations in Winter, but other than that they usually run well. If you buy the pack you get your QFF points (or can credit to JL mileage if you prefer), along with enough credit for a snack and drink on board. I certainly am happy to fly GK when the price saves me. Only downside for me is the lack of lounge access.