The most competitive competition is between Leverkusen and Bayern Munich because the two are much closer, but Leverkusen's consistent performance to date has made it difficult for Bayern Munich to shift their position in the standings. There is an opportunity to shift Leverkusen's position when the two meet in the second leg, but it looks like it will be a little more difficult because in the first leg Leverkusen managed to hold Bayern Munich to a draw at the Allianz Arena.
Both Dortmund and Stuttgart are far from catching up to the first and second standings because of the difference in points so it will be quite difficult for both of them to catch up. For me, it is not yet time to judge who will emerge as Bundesliga champions, but I hope that Leverkusen will continue to be a strong challenger to Bayern Munich until the season ends.
In the next rounds, Bayer will have to play against Dortmund and Stuttgart, perhaps these games can change something in the table. Bayer's winning streak is impressive, but how long can they maintain this pace? Of course, if Bayer wins all these games, then Bayern will need to decide everything from the match with Bayer. Although I doubt that the fate of the championship can be decided by one match, there is still a lot of round ahead, and winning streaks will come to an end...
Yes it is and it looks like there will indeed be changes in the standings as a result of the two matches against Dortmund and Stuttgart, there are two possible changes that can occur, between Leverkusen can move further away from Bayern Munich's pursuit by winning the full three points or even losing points and being equal to Bayern Munich with a very thin point difference, but what is more likely in my opinion is that maybe Leverkusen will share points in their first match against Dortmund later.
But on the other hand I wouldn't be so sure about that result because Leverkusen's position is still not safe even though they are in the top position because Bayern Munich can always make their point difference thin, I don't know what Xabi Alonso will do but certainly they will pull out all their abilities or that means they will take advantage of all the opportunities they have because after all all the matches they will face whether it's against strong or weak teams are very valuable to maintain their dominance. Yes your question is probably the same as mine about how far Leverkusen will maintain their consistency, honestly it's still beyond my expectations, but even though now they are still very strong but that doesn't mean it's impossible for them to slip whether it's in the match against Dortmund or Stuttgart or the next few matches, I think we can only wait.