Nothing can stop Leverkusen to win Bundesliga this year and I will keep this bold prediction for the rest of the season. Sure , Bayern looks strong , healthy and always ready to win but Leverkusen looks more like a team than Bayern in my opinion and this will be a huge advantage when they will face each other later.
Also , Stuttgart really wants to catch an European spot for next year and by the way they are playing right now , they can achieve at least a Conference League spot.
Leverkusen's chances against Bayern are still a bit of a long shot. I understand your perspective; this season, their sense of team spirit is exceptional. However, we can't simply disregard Bayern's supremacy and their ability to win the Bundesliga consistently. Although it can get a little boring at times, their reliability is what makes them so strong. I can't help feeling cautiously enthusiastic about Stuttgart. They're making a lot of effort for Europe, and their recent games has been excellent. Nonetheless, maintaining that kind of performance will be difficult. Although they're now in a strong position, sustaining that over the next six months will be the true test given how unpredictable the Bundesliga can be. Though I've watched enough football to know that anything can happen, I'm optimistic