It still seems you are not getting this.
Lets do the timeline with the three major events:
1) The Doctor and Rose go back in time to meet Queen Victoria. They are chased by a werewolf and are able, with the telescope, to defeat it. Then Queen Victoria thanks them and tells them to leave Great Britain forever. Then, when leaving the Torchwood Estate, she announces her plan to create the Torchwood Institute.
2) At some point in the next hundred and thirty years (possibly quite early on) the two timelines diverge, creating the alternate dimension. It doesn't matter that no travel between the two is possible, it simply happens. The Doctor is in this timeline (who knows? It might have been him that, in an adventure we see off-screen, created the alternate dimension)
3) The events as depicted in The Rise of the Cybermen et al happen.
Thus a simple explanation. Okay?
We'll just have to agree to disagree. But I know Im right...
