Now I can't possibly comment on everything Danny here
but I have to credit him for taking the time to write it, he raises some very good points and he has obviously thought this through, so kudos for observations and imagination here
Of course I loved it, although thats my opinion of course. But I can comment one some of the points he made. Let me try to reflect on a few.
The ending with the Titanic was really odd, as how can you breach the TARDIS interior? That really puzzled me, but my only guess is that there is something planned. In fact, it is not true that Martha is leaving forever, according to reports, she will be back at some point in series 4, thats why she gave him the phone, my guess is there is going to be an event on present day earth in which Martha returns. I do wonder though if that was all planned.
I say planned as my theory is that we will be seeing two Doctors on the Titanic. As we know for a fact that the Doctor has been on the Titanic before, and had to jump into the water to avoid going down with the ship. It might sound nuts, but don't dismiss it just yet, as i find it hard to believe The 10th Doctor could be on a ship he has already been on without encountering himself, for all we know the 1st law of time has been broken in this case.
The idea of Lucy Saxon is a curious one, she was acting weird as you can see faint bruises on her face by looking at her carefully, showing signs of mental anguish. But there is that condition in which people who get captured can be manipulated to believe their captors meant no harm or ill intent. My guess is that was the case with Mrs Saxon, she was beaten, but felt The Master was good to her, i reckon is was her that stole The Masters ring at the end as the hand looks uncanny like hers, which would serve to backup my point about her.
I tihnk when the Doctor locked the TARDIS between two points, I think he meant between two points in time. As it only mentioned the years it could go, it gave no indication it locked between two points in space. just time, therefore thats what he ment by locations
The aged Doctor bit, i guess was an exaggeration of what happens when you age, you wither and shrivel, nuff said really.
thats all the points i feel I can comment on really, notice I have not taken any side in this argument, the aim of this post was to try and figure out why things were presented as they were in response to Dannys post