My theory for the 50th anniversary episode

I have a theory for the 50th anniversary episode. I don't think 10 and 11 will meet due to a time paradox, I think it will be much simpler than that. I think 10 will be living flesh, or a ganger, from S06E06.

But that was 11, you say... the 11th Doctor's ganger was killed, you say...

At the end of that episode, when the Doctor-ganger and the scientist are blocking the exit from the monster and the factory is about to explode the Doctor says 'Your molecular memory can survive this, you know? This may not be the end.' Then he passes the ganger his sonic screwdriver.

What if 10 in the upcoming episode is the ganger that was killed when the acid factory exploded. His molecular memory was retained by the living flesh (which somehow survived) and reincarnated him. But instead of reincarnating into 11, it has a random chance of reincarnating into any of the Doctor's regenerations and randomly lands on 10.

I apologise if this doesn't read too well, it is very late here and my brain is all fuzzy from essay writing all day.