MCU: 12 Things We Learned From 4Chan's Latest Marvel Movies "Leak"
7. Avengers Infinity War Won't Include The Entire Heroic MCU Cast
The Rumour
Avengers: Infinity War will focus on the core Avengers (Captain America, Iron Man, Thor, Hulk, Black Widow, Scarlet Witch, Hawkeye and Vision), and it won't be until Avengers 4 that The Guardians of the Galaxy and the other heroes will join up.
Additionally, the movie will set up Captain Marvel and Doctor Strange will be making an appearance.
Response
This just feels like informed guess-work more than anything, though the removal of the Guardians from the fray until Avengers 4 seems a little strange. Maybe they don't need to over-stuff? Maybe they want to withhold some charm until the sequel?
The Captain Marvel stuff has been heavily hinted at before: casting Brie Larson now means they have plans for her before Captain Marvel, and it seems likely she will appear as Carol Danvers before her origin story in her own movie.
And if it's to be believed that the Time Stone shows up in Doctor Strange, then of course he'd appear.