aridas sofia wrote:
We also know that somewhere (was it the Cartmel plan?) the Doctor is said to have originated as a 19th century human scientist that developed time travel and made his way to Gallifrey to become The Other.
Nope, this is from the original novel, Human Nature that later became a Tennant story. Unlike that's Journal of Impossible Things, this is the plot of the stories that the teacher John Smith writes in the novel instead.
What's most interesting is that in his notes (that used to be online before the BBC took down their eBooks), Paul Cornell says that these sections were written by a friend of his... Steven Moffat.
Whether this will actually affect anything in the present day of the show, I doubt it, but it WAS Moffat's idea.