At least they should try to defend their first position because it is very difficult to maintain the best position because there will be many opponents who will try to knock them down.
One of them is Dortmund, and both will face each other on Alte stadium Berlin next week, so if Union doesn't have trouble and can win easily will determine their next step. Union is beyond expectation for this session, many observers said this season is the same as last year with the same club, Bayern, Dortmund, and Leipzig, but Union appears at the top of the rank. with this hype, Union will make a surprise win with 2 different goals next week.
Bayen Munich is not what it used to be because the best players are out so they can't afford to get many more goals, while Union Berlin they have a team that can learn well because now many of them are professionals and finally they always get the win, while Union Berlin and Dortmund will probably be won by Union Berlin because it is impossible for them to shift the first position and snatch it from Union Berlin.