The difference between Bayern Leverkusen and every other clubs is there consistency in wining, I don't know if I will call it luck but this season has been something else for them because is been a while they pull this kind of performance by remaining unbeaten, that's a very commendable performance by Bayern Leverkusen, imagine wining Bayern Munich three consecutive times with a strong pressure, although there wining against Wolfsburg was actually expected because there is no way they will win Bayern Munich two times and will not win Wolfsburg so it was expected.
Your point is just the exact truth of the case with Bayern Leverkusen. Consistency has been a very key factor that has helped them gone a really long way, as they wouldn't have been able to have come this far if they have not been consistent enough with their performance, even Across Europe they have maintained an uncommon consistency this season and it's been really helping them in their position.
If something happens once it can be seen as lucky but when same thing has been maintained over a period of time and its still happening almost bin exact same way then it can be seen as consistency and the results of hard work so it will actually be unfair to say Bayern Leverkusen is just lucky because keeping that asides, you will agree with me that even while on the field of play, these boys give and put in their very best, they play a very nice and interesting game such that you don't get to be bored by their performance so it's basically their hard work paying off for me.
It's earlier at the beginning of the season that I could have seen them as been lucky but now I think they have gown pass the stage of just been lucky to been productive, they are not showing this kind of performance only in their domestic League but it's been same across Europe so I think it's enough to say they are productive and their hard work, diligence and consistency is actually paying off at this point.