Howling:The year that never was and davros reality bomb

I was just wondering about the very famous plothole in last of the timelords, why didn't the year that never was coincide with the reality bomb. There has been alot said about this, and I think the most likely is that the end of the lost year happened just before the stealing of the earth. I.E had time not been reversed then the Daleks would have snatched the earth and the plan would have gone ahead, a week later. However this still does not explain alot of other things, for instance, why didn't rose help out Martha. Rose was meant to have been appearing for like a year before Stolen earth/Journey's end so she should have been around during the lost year, the end of the lost year is still no matter what you say near to the stealing of the earth so why wasn't she around to help out with that big gun of hers. I'd like to know your opinions on this and also what you guys think would have happened if time hadn't been reversed and the the master ruled earth had been snatched by the Daleks, pretty interesting thought eh.