In general, it is impossible for Leverkusen to lose against Darmstadt and they are certainly targeting 3 more points in this away match. Leverkusen may have played less than optimally against Mönchengladbach and in the end they had to pay off with a win in the next match. If not, then it will be easier for Leverkusen to be chased by Bayern Munich and that will thwart Leverkusen's chances of winning the title.
There are top matches that's consider simple for Leverkusen to accumulate three points, upcoming game against Darmstadt, it's definitely not what to worry about because they're no threat. Moreover, Xabi Alonso is competent for the tough games, he just need small time to rearrange his squad and ensure things works smoothly on their end. It's challenging for Bayer Leverkussen to continue streak winnings in matches but it becomes easier for the same team to record winnings because they have one of the best competitive squad.