The World Cup has been full of surprises. Of the five teams rated most likely to win the World Cup before the tournament by FiveThirtyEight’s Soccer Power Index, only France won its first match. Spain, Argentina and Brazil could manage only draws, and worse yet, Germany lost to Mexico. While Spain’s 3-3 draw against Portugal can be excused — Cristiano Ronaldo’s team is rated the eighth-best side in the tournament and has legitimate hopes of winning the whole thing — the other three face larger problems. Germany’s difficulty may be the most acute.