Seems to me the same tidal effect that is moving the Moon away from the Earth might be invoked to move close giants out from their sun. Two points against this would be that the fluid state of a star/sun might not give the same tidal effects, from what I understand, and that it would probably just take way too long, the planet's tidal force on its sun being rather minimal compared to that of the Moon on the Earth. All in all, I would doubt this being the explanation, but I thought it worth mentioning.
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