Finally I was right that Leverkusen were not going to have another unbeaten streek this season, I knew they didn't have much issues with their team, neither was their strategy or tactics faulty but the fact that they have gotten so much attention emanating from their performance in the past season will exert some forms of pressure on them...
It is true that reaching a new record in the near past will make things difficult for Bayer Leverkusen this season since as you mentioned they are trying to keep their good record in front of their fans and the other teams so they are playing under pressure. Besides Leverkusen aren't scoring at the end of the game as they used to do in the previous season. This match against Leipzig showed how they were watching their two goals advantage became a defeat in the first half hour of the second period..
Leipzig are the first right now and I think Bayern Munich will follow soon.