So basically, my theory is that after the end of series 8, the original Rimmer flies up to the ship as Ace, but on the way, crahses into a planetoid that get knocked into the white hole. Since a white hole has 2 ends, an entrance and exit, he has completely blocked up the white hole. This pushes everyone (Including Kochanski because reasons) back in time to the original White Hole episode. However, they still remember everything. This would make for an interesting 'Series 9' as Original Rimmer, Lister, Cat, Kryten and Kochanski have to avoid their past selves. At the end of 'Series 9' they steal Red Dwarf while the past crew are on an ocean moon battling a Despair Squid. This would explain why Red Dwarf is it's original size and shape. This would also mean the nanobots never stole Red Dwarf, but it was a ruse set up by the futurey crew so they could get Red Dwarf back.