Howling:Dalek army and Cyberking?

I'm not sure how the Doctor could have encountered Davros' Dalek army in The Stolen Earth/Journey's End or the Cyberking in The Next Doctor in the first place, because if you think about it, they had already been erased from existence. The proof of this is the fact that in Silence in the Library, the Doctor first meets River Song. This episode takes place before TSE/JE in the Doctor's timeline, but the River here is from a point long after her adventures in Series 5 and 6. If River's future already exists, then her past must have also happened, including her experiences with the Time Cracks. And because the Cracks must also have already happened, then they must also have already erased the Daleks and Cyberking! Any thoughts on this? 82.20.113.152talk to me 21:03, August 2, 2012 (UTC)