I agree with you that consistency is something Leverkusen must have if they want a Bundesliga title this season, especially since it's only Week 7 and they still have a long way to go to get closer to the championship. Sometimes teams can be consistent until halfway through the season, but in the second round they lose it and in the end it must make them fail to become champions. Now they have a good game, their attack line is reliable, their defense is also working well. All they have to do now is maintain what they've shown so far and also improve their performance.
Their consistency may be damaged when they enter a lot of matches and this can be caused by player injuries and which often destroy what has been built since the start of the season, that's why it is very important to have a squad that is equally good between the core and reserve players because the number of matches is almost difficult for players to avoid injury, especially as Bayern Leverkusen not only plays in domestic but also European competitions. But so far the quality of play built by Xabi Alonso is very good and as you said if it is consistent it is possible that we will see a new champion this season and not see Bayern Munich dominate again, but that is still very far to see and many things can happen, because a team like Bayern Munich can always find the right way to lift the trophy again.