Yeah actually Leverkusen are now in the final stage, and given to their currently performance i don't think they will be a team that will able to beat them now to reduce their points. Because they have a high point in the in top standing that even thought they lose to one teams they will still claim the the tittle, since is not that they have much remaining is just a few game they have left and although that their not a strong team I don't think they will lose to any of them.
I think Dortmund will hand Leverkusen their first defeat of the season. That would really hurt because there would only be 5 games left at that point. In fact, whatever the result will not change the fact that Leverkusen is the Bundesliga champion this season. But ending the league as champions with an unbeaten record would be history that will never be forgotten in football. I'm sure Alonso is also motivated to get an unbeaten record. Currently there are 4 matches left and there are several strong teams they will face. I think VfB and Frankfurt will be a challenge for them to maintain their unbeaten record.
Dortmund and Bayer Leverkusen are strong teams that are dominating in this season, that is making people to prefer Dortmund as the strongest team in the Bundesliga competition, but they are not toping the table like the way Bayer Leverkusen are toping the table to remain unbeaten.
I'm very sure that Bayer Leverkusen is the strongest team in this tournament, and if Bayer Leverkusen meet Dortmund their remaining games,they will surely take victory from them to continue leading the table until they lift the trophy to take a good record from this season.
I guess Bayer Leverkusen will make those 4 games remaining to be different from what they have played before by making it happen for their favor without struggle for it to happen.