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.
Regardless of what is happening right now I think it's still a little difficult for Leverkusen if their target is the Bundesliga champions but with the current conditions especially if the situation lasts until the end of the season in consistency then indeed the possibility of them being a candidate is just that they will still only trouble Bayern not to become Bundesliga champions.
I know that Leverkusen's current performance is good, it's just that in terms of conditions, Bayern is still an unchangeable favorite, especially with the hegemony they always create in every season they always run, so indeed Bayern remains the main favorite to win the Bundesliga.