Ok, so Rush gets that ship working, thats pretty much a given, but the destiny travels at random, so knowing where its going to be is impossible, knowing where it used to be is not.
What if Rush takes the ship back in time somehow, and that bit at the end of the show in an early episode of the pod leaving destiny was Rush's ship leaving after having dropped him back off on destiny?
Rush knows which parts of the ship are empty, and he knows where everyone is going to be for the next few weeks.
With a brain like his it wouldnt be too hard to keep out of everyones way until the time was right to re-make his appearence.
What if Rush takes the ship back in time somehow, and that bit at the end of the show in an early episode of the pod leaving destiny was Rush's ship leaving after having dropped him back off on destiny?
Rush knows which parts of the ship are empty, and he knows where everyone is going to be for the next few weeks.
With a brain like his it wouldnt be too hard to keep out of everyones way until the time was right to re-make his appearence.