5. Does Saving Gallifrey Mean That None Of RTD's Era Meant Nothing?
No. The Doctor explained this the minisode 'Good Night', so it's quite easy to miss, but still, perfectly simple as an excuse. Time travellers can have two versions of history in their head. Rory remembered his 2000-year wait in an alternate timeline, but not all the time. And the Doctor claimed that everyone has a memory that never happened, or they can't remember something important. "Memory really is like that," he said. The Time War ended two ways. There are two timelines, and neither really impacts on anything other than the Doctor: the Daleks survived anyway, the Time Lords aren't around, everything's the same apart from the man who lived through it. And he has the two versions in his head.