Skyfall biograftur

Sherlock-overlevelses teori - take a look!!

Sherlock texts Moriarty to meet him at Bart's Hospital rooftop, so Molly or Mycroft's people could know that he's likely to make that jump from that roof but not from which corner (if Sherlock had already figured out that Moriarty wouldn't stop until forcing him to commit suicide by threatening his friends)

When they start talking about suicide, Sherlock leans out with Moriarty to watch out the street, there there is almost no one and two double-decker buses, one of them placed on the spot where he could jump to.  Sherlock frowns.

Minutes later, he glances again to the street, there we see the same two buses, and some more people, Moriarty says "oh. you've got an audience now", then we see a man wearing a beige coat and a beige hat knocking on the window of the bus with a walking stick and probably talking to the driver. My guess is that he's showing a police badge and telling him to move away and clear out the spot.

Sherlock asks for a little time
would you give one moment, please? One moment of privacy, please?

He's likely to be waiting for everything to be in place, then he sees something, his face changes and starts laughing (I think this is when the bus was replaced by the garbage truck that we'll see later)

Later on, he talks to John making his best to avoid that John came too close and figured out the farce (besides, he was being watched)

- turn around and walk back the way you came (...) just do as i ask - please
- where?
- stop there!
- (...) Stay exactly where you are. Don't move. Keep your eyes fixed on me

After the jump, Watson turns around the corner and we see a biker approaching from his back, and we have a glance at a body (supposedly Sherlock's) covered with blood behind a garbage truck. 

Then the biker knocks down Watson, in spite of Watson being almost perfectly still and the good visual that the biker had, so this seems completely intended to daze him (the biker doesn't even bother to apologize or help him to stand up).

We see people approaching the body as the garbage truck leaves the scene on the left corner.

My guess is that Sherlock jumped to that truck, survived the fall thanks to the garbage bags (quite a landing, anyway) and another body was threw out of the truck almost synchronously.

The pedestrians, the biker, they are either Mycroft's agents or Molly's friends. 
The body Watson checks it's possibly a corpse that Molly had obtained from the Hospital and disguised as Sherlock (may there was indeed a Sherlock's mask wore by Moriarty to scare the kids, and Sherlock had previously found it, but that might had not been necessary if Molly had found a good double and knowing that someone was going to make John even more confused).

I think Mycroft is definitely involved, so he could place agents as pedestrians, clear out the landing spot, and in the upcoming season, be able to clean up his brother's reputation (tell the police and the press that everything was staged as play of the Secret Service)

"Here's my theory, and I'm sticking to it (I can't take credit for it- I've read it a couple of places but it's the one that seems the most workable to me from the clues given):
When Sherlock asks Moriarty for a moment of privacy (the out of character thing I believe Moffat was referring to), that's the last time Moriarty AND the audience see the sidewalk until Sherlock is lying on it. But in the meantime, the double-decker bus moves and is replaced by a laundry truck (not trash. laundry. full of soft stuff). And more people start milling about on the sidewalk.
When John arrives, Sherlock makes him stand in a particular place, and stare at him up there on the roof. Why? So that John won't walk around and see what's happening on the sidewalk behind the short building between them. It also means John has farther to travel when Sherlock jumps.
So Sherlock jumps, and is clearly shown hurtling toward the pavement perpendicular to the sidewalk, but then is shown landing parallel to it. I think he landed in the laundry truck and then jumped to the sidewalk.
Note that he lands in a particular way. He is immediately surrounded by people on the sidewalk (the homeless network?), some of whom are dressed as hospital staff (something I think Molly could help with, among other things). One, dressed as a doctor, spends a suspiciously long amount of time with his hand on Sherlock's neck pulse point, and can clearly be seen shaking Sherlock's arm as John approaches. (John, of course, has been delayed by the collision with the bicyclist and is disoriented from his spill on the asphalt.) All of this conspires to make Sherlock's right arm the most convenient place for John to take Sherlock's pulse.
But wait! How do you fool a medical doctor trying to take a pulse? With a little rubber ball placed strategically under the arm, with which one can conceal the pulse in that arm. Remember the ball Sherlock was fidgeting with in the lab after talking to Molly? If you watch carefully, you can see him slip it into his pocket before sitting down. I think that ball was between Sherlock's right arm and his body.
Once John's hand is pulled away from Sherlock's wrist, he is himself surrounded by onlookers and loses sight of Sherlock's body. So does the audience. We don't see it again until it's lifted onto the gurney. If you look closely at the gurney as it's wheeled away, you'll see that it's definitely not Sherlock by that point. This COULD just be sloppy camera work and Cumberbatch's usual stand-in, since it was snowing and frigid the day this scene was filmed, but that sloppiness seems unlikely for a show as tight as this one, and it seems like that shot was specifically intended to let the viewer watch the body being wheeled away.
So why did Sherlock need Molly? For spare blood, possibly a spare body (though I think it's just as plausible that it was a live person dressed similarly who would have an easier time slipping away once wheeled into the hospital), and it wouldn't surprise me at all that Sherlock would need a doctor who specializes in the dead to show him the rubber ball trick- seems like something a pathologist would learn while procrastinating studying for exams. Also- remember that Molly was there when Sherlock went to the morgue to identify Irene Adler's body- she would be able to ensure that the paperwork for Sherlock's death certificate could get done without making John come in to officially identify him. John and Lestrade would both trust her.
What definitely did NOT happen? Sherlock did not throw Moriarty's body off the roof. John clearly saw a live Sherlock standing on the roof, who then jumped, and clearly saw him flailing during the fall.
EDITED TO ADD:  I'm working under the assumption that Moriarty shoots himself because he realizes that it's the only way TO beat Sherlock- it's the only way Sherlock will be convinced that there's no other way to call off the snipers. His endgame was to discredit Sherlock, disgracing him and separating him from everything he loves, preferably by killing him, but that's not strictly necessary. Even if Sherlock didn't jump, the snipers would kill everyone Sherlock has ever cared about and Moriarty still wins; Moriarty's actual presence is not required. Basically, killing himself is the only way Moriarty could hope to assure his own victory, and his obsession with Sherlock is such that beating him is more important than his own life. 
And if you think about it- even though Sherlock survives, his reputation is still in tatters and he's still cut off from his friends. Moriarty has still won, at least temporarily."

 (kilde)