And Vision and War Machine can be dealing with one problem, while they’re off in Lagos dealing with another problem.
Given that the Avengers mission in Lagos winds up going horribly wrong, with Scarlet Witch accidentally causing massive collateral damage, hindsight suggests that Vision and War Machine probably would have been helpful assets in the field.
They’re beginning the mission undercover, and it’s easy for Wanda and Natasha to be undercover.
We wanted to show that the Avengers were functioning like a military unit now – that they would take specialist into each location dependent on what was required.