Dalek Caan says "one will still die" as everyone boards the TARDIS, and -- assuming that he doesn't include himself (in the third person) in the statement (do we know what happened to him?) -- who really dies? [Donna? That point is still being debated.] Certainly, your theory ties to that statement -- in that 10.2 (not quite 11 yet, I think) later gets left in Pete's World/Afterlife/Ten's Heaven.
But really, I think that you've articulated the awful/wonderfulness of Pete's World.
And yes, the wrong Doctor is there now: it was the obsolete model that should have been retired. 10.2's first exit from the TARDIS, post-regeneration, was accompanied (emphasized?) by the same blinding TARDIS backglow that heralded Ten's revival in TCI. That visual cue is a very important reminder in a season finale packed with flashbacks!
However, what I don't get is how a TimeLord's hand would regenerate into a Human's body? Pushing the point, wouldn't a human body in this situation look like, human-Donna, rather than Timelord-Ten? Furthermore, it took a spark to activate the timelord presence in Donna's mind; is it possible that another crisis could jump start a second heart 10.2? Bottom line: who says 10.2 is human? Face facts, they were totally wrong about Jenny's ability to regenerate!
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But really, I think that you've articulated the awful/wonderfulness of Pete's World.
And yes, the wrong Doctor is there now: it was the obsolete model that should have been retired. 10.2's first exit from the TARDIS, post-regeneration, was accompanied (emphasized?) by the same blinding TARDIS backglow that heralded Ten's revival in TCI. That visual cue is a very important reminder in a season finale packed with flashbacks!
However, what I don't get is how a TimeLord's hand would regenerate into a Human's body? Pushing the point, wouldn't a human body in this situation look like, human-Donna, rather than Timelord-Ten? Furthermore, it took a spark to activate the timelord presence in Donna's mind; is it possible that another crisis could jump start a second heart 10.2? Bottom line: who says 10.2 is human? Face facts, they were totally wrong about Jenny's ability to regenerate!
I'm not finished with Donna yet!
P.S. - Love your screencaps!