Players who suffer injuries will certainly greatly affect the team's performance, although it is not comprehensive, there are definitely things that make them lose control. I'm sure there will be a time when this team experiences this and until that happens they will be fine without any problems. The rivalry between Leverkusen and Bayern Munich will always be a hot topic of conversation and both of them are the teams most likely to win. Dortmund this time is not like the previous season and it looks like they will not participate in the race for the title considering their erratic performance.
The rivalry of these clubs for the Bundesliga title are on different titles this season, we just pray and hope for our favorite clubs to win games and lift major trophies. Borrusia Dortmund doesn't suit into the high competitive standards set up by Leverkusen and Munich. A club performance depends on the key players abilities and the tactics implemented by the coach. Bayer Leverkusen and Bayern Munich players doesn't sustained any critical injuries and if they do, the club have backup players and they're holding for for incredible performance this season.
But, if they can keep their players fine, then of course the competition between Bayern Munich and Bayer Leverkusen will continue until the end of the season. I personally don't expect any serious injuries from these two teams at the moment, because of course so far they can still get good results because their players are still fine. Therefore, of course it would be very unfortunate if, for example, one of the teams got an injury to a key player, then that team would likely be out of title competition. But interestingly, after last match Bayer Leverkusen drew against Dortmund and in the next match Bayer Leverkusen will play against Stuttgart. Basically, Bayer Leverkusen at this moment is at least faced with several matches with difficult opponents . So yes, at this moment Bayer Leverkusen faces a challenge which remains difficult of course.
Speculating about potential injuries is pretty wild and kind of absurd, sorry, but this is not an insult. I was just trying to figure out how someone would conclude after thoroughly thinking about it, that Harry Kane does not get unfairly tackled by some defender who's gone out of his mind and then gets injured in the process and misses three months of the season. How? You say that you don't expect any serious injuries when Wirtz from Leverkusen is probably a suitable counter example. This is something that I would not want to have to predict ever because there is nothing to predict really.