Potential Allegiance Switching
The teams we see before us in the build-up to this movie might not be the teams that end up being together at the end of the movie itself, as there is always the possibility that members of each team could decide that they are fighting on the wrong side and switch allegiances mid-conflict.
There are rumors, for example, that Black Widow is actually working undercover on behalf of Captain America to infiltrate Iron Man’s team and find out how to defeat them and/or what their plans are, while Spider-Man is expected to start on Iron Man’s side and could switch allegiances, as he did in the comic book version of Civil War.
Essentially, a switch in allegiance could swing the tide in favor of the team to which any given character moves, which could be decisive in the overall outcome of the battle.
And speaking of a certain Webbed Wonder…
