This just popped up on my Facebook news feed, I've not read it all, but thought I'd share anyway.
I didn't see the need to off Ianto, as they already had Jack sacrificing his grandson.For the writer, Ianto's death was a means to show the cost of immortality for Captain Jack Harkness: a character who could only live to see everyone else ultimately die around him
Like I said, to increase the sense of loss & alienation & change at the end. Not only has Jack lost everything. When Jack leaves, it sweeps away pretty much any remaining elements that Gwen had during her Torchwood tenure. Other than the human race not getting wiped out, the only light at the end of the tunnel is Gwen & Rhys & their baby. The point of "Children of Earth" was to make things as dark & difficult as possible. (That's also why the Doctor didn't show up. He doesn't fit with the oppressively dark tone of "Children of Earth.")
I wasn't indicating the Doctor should show up for COE, but that at the end of at least one TW episode, we heard the TARDIS, which was the lead-in for Jack's appearance in DW.
I don't remember off-hand how or if they explained all of Jack's DW appearances that way.
As for my personal in-universe theory for why the Doctor didn't come to help Earth during the "Children of Earth" crisis: I think the TARDIS scans time for cataclysms that the Doctor could solve that no one else could. Since Jack was able to resolve the situation with minimal collateral damage without the Doctor's help, the TARDIS saw no need to intervene in the crisis. (I'm more curious about what Sarah Jane's response to the situation would have been.)
What to be alone? He's not really alone though...not like the Doctor is if that is what you are referring to.
And theoretically JAck might well outlive the Doctor!
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