Well, you have to look at it from the characters' point of view. ( <--- And that goes for any story; you have to remember that the characters don't know the things you know and figure out what they do based on their limited knowledge.)
David is not normally in contact with the Doctor, so he knows very little about anything that's happened to him since series 5. In my mind, he has re-encountered Eleven once, met Twelve once (though I have no story planned for this; I do have a story in the works where Twelve is in the background but they don't actually meet), and meets Thirteen once in the above story (could do more, but it would have to be after the Timeless Child obviously and he has not encountered her from Flux forward).
David doesn't know that his Doctor's face returned or that the bi-generation even happened, and though he might have encountered the Flux (he might have been in the far future or distant past through the whole thing), he doesn't know that it had anything to do with the Doctor or the Time Lords.
So, when I say that it's "important" to him, it's not personally important - he's not thinking about it and trying to figure out how it affects him, because he doesn't even know these things thappened. To him, like to all other Time Lords, bi-generation is a myth.
However, Ten came back as Fourteen, and that's his Doctor, the one who created him and the one he's closest to (relationship-wise, not character-wise). Moreover, Fourteen didn't leave - he should have had his fifteen-hour life and died, but he bi-generated and is now retired on Earth. To top that off, Donna's back, with full faculties and with the metacrisis cleansed from her, even though David killed her back in the his first story.
So, I'd think that the return of his Doctor would be pretty important to him (as in, something that he doesn't actually know about but would be something that would greatly enrich his life), and resolving the paradox with Donna using the Toymaker's jigsaw line is important for David's continuity (not to mention helping him resolve his guilt).
no subject
David is not normally in contact with the Doctor, so he knows very little about anything that's happened to him since series 5. In my mind, he has re-encountered Eleven once, met Twelve once (though I have no story planned for this; I do have a story in the works where Twelve is in the background but they don't actually meet), and meets Thirteen once in the above story (could do more, but it would have to be after the Timeless Child obviously and he has not encountered her from Flux forward).
David doesn't know that his Doctor's face returned or that the bi-generation even happened, and though he might have encountered the Flux (he might have been in the far future or distant past through the whole thing), he doesn't know that it had anything to do with the Doctor or the Time Lords.
So, when I say that it's "important" to him, it's not personally important - he's not thinking about it and trying to figure out how it affects him, because he doesn't even know these things thappened. To him, like to all other Time Lords, bi-generation is a myth.
However, Ten came back as Fourteen, and that's his Doctor, the one who created him and the one he's closest to (relationship-wise, not character-wise). Moreover, Fourteen didn't leave - he should have had his fifteen-hour life and died, but he bi-generated and is now retired on Earth. To top that off, Donna's back, with full faculties and with the metacrisis cleansed from her, even though David killed her back in the his first story.
So, I'd think that the return of his Doctor would be pretty important to him (as in, something that he doesn't actually know about but would be something that would greatly enrich his life), and resolving the paradox with Donna using the Toymaker's jigsaw line is important for David's continuity (not to mention helping him resolve his guilt).