Unfortunately Xabi Alonso team did not profit much from Bayern Munich humiliating defeat and got only one point from their game against Stuttgart. Bayer Leverkusen were playing away vs a team that is doing pretty good this season in Bundesliga. They were pushing and trying to score and Leverkusen tried too but their opponent were concentrated to not lose home.
Indeed. Leverkusen failed to get an advantage from a big lose of Bayern Munich. But Leverkusen could get 1 point at least, they also can keep a positive result. They could keep their status as an unbeaten team so far. So, I don't think this is a very bad result for Xabi and Leverkusen. I can understand that it wasn't an easy match, they play away against one of the strong team in Bundesliga (Stuttgart). We must realize that Stuttgart is one of the shining teams in Bundesliga this season.
Leverkusen needs to be a little more patient because they still have a long way to go, even though they can't take advantage of Bayern Munich defeat, at least they can take advantage of Bayern Munich busy schedule in the UCL competition. Because sharing points with Stuttgart is a worthy result for both of them in optimal conditions. After Bayern Munich faces Man United, they will also face Stuttgart so this could be a good opportunity to prevent Bayern Munich from chasing Leverkusen points. But because they also have to face Frankfurt, it is certain that the obstacles before their eyes will not be easy.
Stuttgart is very strong this season. The match between Leverkusen vs Stuttgart was very competitive. Stuttgart's players performed well in their home match, yet Leverkusen managed to get 1 point from this match. Leverkusen will play against Frankfurt in the next match. I don't consider the Frankfurt team to be very strong, but the way they dominated against Bayern Munich was admirable. Frankfurt will also want to win against Leverkusen.
Bayern Munich are likely to drop points against Stuttgart. This team has good performance of attacking players as well as strong defense. So the match against Bayern Munich has a high probability of a draw. And if Munich drop points in this match too, it will be very difficult for them to regain the top spot in the table.