Captain Marvel is going to level the playing field of power levels in the Avengers Team facing Thanos in a rematch, but she will part of the team effort, not the out-of-nowhere mcguffin that defeats Thanos. the Russo Brothers are way too smart and superhero savvy, for a newcomer to be the one that defeats Thanos, it will still be the original Avengers, aided by all the members they have added since forming the Avengers Initiative. A4 will be a great movie!
