^ I'd forgotten about that. It's been such a long time since I've seen any of season 4.0, probably since it first aired.
And I agree with others here, they'll get back to the Earth stuff just as soon as this mutiny is over and done with. The mutiny is the natural progression following the reveal of the nuked Earth, and trying to delve too deeply into Earth's mythology before the mutiny could be played out would have diluted it's effectiveness.
At this point, I'm thinking the Cylon jump drives plot is just a way for the RTF to get back to Earth quickly when that storyline is ramped back up again.