I'm not doubting that Borussia Dortmund cannot get a point from Bayern Munich at Allianz Arena this season. Borussia Dortmund need to beat Bayern Munich at home if they want to remain in the fourth position in the Bundesliga table, but I don't see that happening this season because Borussia Dortmund is struggling to win their matches in the Bundesliga.
You are correct, Dortmund should not lose their next game against Bayern Munich, they will no longer be ranked in the top four. Dortmund has not shown any evidence this season that they are superior to Bayern Munich, but we shouldn't underestimated Dortmund just yet. In this second meeting, anything can happen because both teams have a crucial match their next Champions League match, which they will want to concentrate on because they don't want to lose in the next round. In my opinion, this match may end in a draw. I understand why you believe that Dortmund lacks the strength to overcome Bayern Munich, they haven't played well lately, and Bayern Munich won their first match with 4 goals.
Leipzig will play Mainz in their next game, and Leipzig will easily secure three points. Dortmund leads Leipzig by one point, which is not safe at all. Dortmund may lose the position after that game. The most important thing for Dortmund against Bayern Munich is to draw the game if they are unable to win. Because i don't trust Bayern Munich's performance against major teams.