Infinity War is the prequel to Avengers Endgame. So, it's obvious that some aspects of Endgame will be based on something we saw in Infinity War. We can say that even if something in Infinity War seems flat, it is possible that it hides a deeper meaning that what is shown to us. One particular moment in Infinity War that is being speculated to foreshadow the events of Endgame is the scene where Tony enlightens Pepper about the dream he had.
This dream was about Tony and Pepper being blessed with a baby. Pepper confirmed in the movie that she was not pregnant. But this isn’t enough to let fans not speculate if this could come true in Endgame.
According to a fan theory presented by a Redditor, this alleged dream was not a dream at all. But actually, as the theory quotes it, “an effect of causal (yes, that's causal, not casual) loop due to time travel”. What Tony believed was a dream was actually a future event from some timeline caused by time manipulation. This time manipulation will be seen in Endgame and this manipulation is responsible for sending back a memory, in this case, about Tony and Pepper being parents to a baby.
Here’s what a casual loop is – “It is a paradox of time travel that occurs when a future event is the cause of a past event, which in turn is the cause of the future event. Both events then exist in spacetime, but their origin cannot be determined. A casual loop may involve an event, a person or object, or information. The terms boot-strap paradox, predestination paradox or ontological paradox are sometimes used to refer to a causal loop.”
So, you could say that a past event and a future event which seemingly shouldn’t have any relation actually do have one because it was the future event that initiated the past event.
Tony's dream about his child Morgan are actually flashes from future, its an effect of time-travel(MCU) from r/FanTheories
This theory implies, that the ‘dream’ was actually a real event from some other reality from some timeline in which the events of Infinity War never took place.
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