Avengers 4 set photos of Captain America, Black Widow revive time travel theory

Avengers: Infinity War ended with half of earth’s mightiest heroes dead and the other half defeated. There are many theories doing the round how the superheroes will defeat Thanos in Avengers 4 and bring half the universe back to life. However, no other scenario looks as likely as time travel, and new set photos from Avengers 4 reshoots have again given the theory a new breath of life.