It can be confirmed that David has had plastic surgery, so this David is definitely not the real David. Because he has no other name, I will call him "David" for the time being. David had a plastic surgery to conceal his true identity and prevent people from recognizing him. So he was afraid who would recognize him? It is certainly not the military. Because his appearance after plastic surgery is still on the military's blacklist, if he wants to escape the military, he won't be so neat. Except for the military, there were only people from Peterson's house and the town. It is speculated that David's true identity must be known to the Peterson family. And there happened to be someone in the film who was known by the Peterson family and served in the military. That's right, this man is the eldest son of the Peterson family: Cayleb.
If this speculation is correct, many doubts will be solved. Let me boldly guess the ins and outs of the story. First, Cayleb participated in the top-secret XX program in the military and accepted human trials. The results of the human test were unsatisfactory or had very bad consequences (Cayleb became a very dangerous person anyway). The military tried to stop the test and dispose of Cayleb, and announced that Cayleb had died. Cayleb escaped from the experimental base, attempting to return home and retaliate against the military. Since the outside world believed that Cayleb was dead, Cayleb asked an unlicensed doctor to help him undergo plastic surgery to conceal his true identity. If it's just like a passerby, Cayleb must confess her XX plan to her family if she wants to go home. So Cayleb chose to go home as his friend David. Cayleb wanted to just go home and have a look, help the family, and then quietly left to continue his XX plan. Unfortunately, his disguised identity was spotted by his younger sister Anna, and she informed all the members of the family. In order for the XX project to continue, Cayleb decided to get rid of all those who saw him through, including his family. Cayleb swayed between career and emotion, and decided to play a game: to give his younger brothers and sisters a chance to survive and kill themselves. This opportunity is to teach his brother Luke to resist and give a knife, and to leave the gun on the ground after killing the black military police in the Halloween maze (actually for Anna). In the end, Anna and Luke defeated Cayleb and were able to escape. But Luke's knife was not pulled out, so Cayleb did not die and escaped in the chaos.
This conjecture is a bit big. In order to prove this nonsense, I have a few more proofs.
1. David helped Luke play punks to win Luke’s favor, but the boss who murdered Mr Peterson cleared the obstacles for Mr Peterson’s promotion, it was done in secret, indicating that he was really helping the Peterson family, not for the sake of it. Bo good impression. And at the point of framing Anna's gangster boyfriend, it is more like a brother who is afraid of his sister making friends carelessly.
2. At the party, the drug dealer Craig said something inexplicable to David, saying what hurt him. And this is the first time the two met, so how hurt. This should be because Craig had taken drugs, had hallucinations, and recognized David as Cayleb. This shows that David and Cayleb are very similar in shape, so Craig would admit his mistake. So it's no surprise that David reacted nervously at the time.
3. In the Halloween maze, David pinches Anna's neck when fighting Anna, which takes a long time. According to his customary way of killing, whether it is a gun or a knife is very neat. Killing Anna can be done with glass shards like killing teachers and black military police, but he chose to pinch Anna's neck, indicating that David could not bear it, or delaying time for Luke to rescue him.
4. The roommate said that he would like to see David and Anna come to a shot, but it didn't happen. Because they are brothers and sisters, the plot is not arranged~~
According to this, the most incomprehensible thing is that the protagonist kills his parents. This point is explained in the film: Finally, in the kitchen, David prepares to kill Mrs Peterson and said that Cayleb will understand He did it. For him, the XX plan is the most important. This is also likely to be the effect of human trials on his mind.
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