the last WC pretty much showed that international football is all about motivation, choosing the right players and deploy a very good defensive system that is able to hold the tie.
it's very different to club football, where a team with 2 wins and 3 loses beats a team that ties 5 matches.
so it makes sense to appoint a great former defensive workhorse captain as manager. dunga had the underrated task to balance a midfield with other 3 non-marking players and did it perfectly. the choice although a bit of a shocker seems pretty matching to the current state of international football. cause as stated before, he brings two crucial things to the table: motivation and defensive knowledge.