New theory?

As of recently I watched a three minute behind scene promo on you tube, which I have mentioned. This and further investigation of some of the wonderful gifs and still shots my fantastic brothers....and sister have provide has lead to a theory I believe takes things a different direction. Taking into account that the trailers aren't meant to create interest, but also to purposely mislead the audience. Many of the sequences are out of order and context. From what I observed I'll try and offer some continuity. I think there will be multiple trips to the caves in the film. I am not sure that the shit hits the fan the first time out. I am almost sure of it. Just to offer up one of the many story arcs I have conceived. I think things may follow as follows. Forgive me for this theory is very near sighted......upon their first trip into the cave pyramid or whatever we have decided on calling the structure up into this point the discovery of the urns take place....among other things possibly the space jockey head. The crew heads back to the ship for examination of findings status reports blah blah. David studies his little science project and reflects back on his conversation with holloway about ...how far are you willing to go.....somehow either in or voluntary infects holloway with that which we see on the trailer that he removes from urn. This scientific approach to beginning infected is why holloways change goes unnotice by crew except for weyland. From this point is where shaw gets the baby...lol. If we look at a close up shot of shaw when she drops to her knees it is David the guy and wheel chair and someone who resembles fifield or at least has a hair cut like him.....sorry I ran out of steam guys.