Originally Posted by Isambard Brunel:
“Join the back of the queue!
1.I want to know why Rory was "the man who dies and dies again", first.
2.And what happened to the plastic Doctor.
3 And how the Doctor dying was a fixed point, if he didn't really die. Etc.
4.Oh, and why did Orson have the Doctor's toy soldier?”
1. He wasn't. He died in Curse of the Black Spot and obviously when he lived out his natural in 1930's. All the other 'deaths' were illusions or in alternative timelines.
2. If you mean Doctor Goo out of rebel Flesh, he dissolved but it may be possible that a copy of his memory survived at a molecular level in the sonic screwdriver, which is presumably still in the castle or has been picked up by a future clean up squad. In short, whereabouts unknown...or storage in the screwdriver didn't work and he ceased to be.
3. The events at the lake are the fixed point, not the Doctors death. As far as The Silence are concerned, The Doctor died. We, know different because we saw him hide in the Teselecta and fake the death we thought was real in The Impossible Astronaut, right kids?
4. Orson got the soldier as it was a family heirloom;
TARDIS visits children home, the toy soldier gets its significance to Rupert
Rupert becomes Danny and soldier becomes heirloom
Orson eventually inherits heirloom and gives it to Clara
Clara gives soldier to crying boy Doctor.
And to answer the OP, The TARDIS was following the plastic soldier, not The Pinks. Clara is no more related to Orson than she is The Doctor, but she ends up taking The TARDIS to the barn (Pink free, you will notice) so that the plastic soldier can fulfill its destiny and help The Doctor tackle his fears.