There is no doubt that the squad built by Xabi Alonso has a very big winning mentality because there are already 3 equally strong teams that they have managed to hold to a draw and the latest is Stuttgart. It certainly wasn't easy with this team's tight pressure and even though they often conceded first, they always ended the match without regrets.
A draw is not a bad result, especially against competitors in the title race and I think Leverkusen are very good and just need to find more points against a team they should be able to beat easily. As long as Leverkusen can maintain its top position, it is clear that Bayern Munich will not be able to catch it this season.
But this is again what we have seen in many of the seasons when Bayern Munich won the title. Bayern loses a game and at the same time their strongest competitors struggle as well. This keeps the advantage at a minimum for Leverkusen and they could have four more points out of those last two games, which I think is again only helping Bayern. It could look much worse for Bayern, but the timing of those other teams to struggle as well is remarkably stupid.