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.
Only advice I'll give to Bayern Leverkusen is to make additional signatures into the çlub during the January Transfer Window upcoming. Tjays so they can meet up with whatever standard Bayern Munich comes with. Bayern Munich have been Champions for too long. I do think its time for another club to take over this season. Shame on Borrussia Dortmund they're the Arsenal in German Bundesliga they literally bottled the league when they should have won.
The Champions League will be difficult to catch, they'll end up qualifying for the Europa League Competition. They will definitely do better than that only if seriousness follows through!