Lets reflect that there are timelines A and timelines B present for before Genesis of the Daleks and after Genesis of the Daleks.
The Movellians, and the Dalek Civil War (and the plague probably?) tied up the Daleks for 10s of millennia in time line B, that we saw no evidence of happening in timeline A.
And then there's the destruction of Skaro in Remembrance that didn't seem to reflect the stellar cartography of the Movie.
Same name, different planet?
New Skaro? New, New, New Skaro? New, New, New, New, New, New, Skaro?