Board Thread:The Panopticon/@comment-6032121-20190914173756/@comment-6032121-20200519173205

But Daleks do not die of old age. The fact is that the Dalek Prime is all but stated in War of the Daleks to have been the Emperor, all along, up to that point in the Daleks' timeline. He was the Emperor at the very beginning, and he's still Emperor now.

There is some wiggle room for his to have gone into hiding at one point or another, allowing for spurious other Emperors; the Emperor in Dalek Attack, who is favourable to Davros, might be one of those. But the fact that two given Dalek stories take place hundreds of years apart shouldn't change anything about whether the Emperor in them can be the Dalek Prime; it's already officially the case, per War and Evil, that the Prime's reign spans a wide breadth of Dalek history and that it changed casings several times.