Let me guess, they're a POC and/or woman with no track record of making action movies?
Because that may not matter. Everyone involved has admitted that the action scenes are pre-vised to death and basically the directors aren't involved, with the directors just doing the talky bits. That's why you can have some of Marvel's high points directed by the Russo brothers, two guys that spent most of their career doing television comedy pilots. (I love Community's paintball episodes to death, but they didn't give the Russos control of Infinity War's action scenes based on those.)