Yes, only one point, so it will not be difficult for Bayer to reduce this gap, there are already 7 points between them and Bayern, which will be much more difficult to reduce and so far I think that Bayern will not allow this to happen, because the level of opponents in the Bundesliga allows them to feel comfortable. But Bayer at the beginning of the season lost a lot of points with teams like Werder, Holstein, Bochum, if you want to defend the champion's title, you need to beat such teams.
In my opinion, Leverkusen should bring in new faces in the second half of the season, new strength can at least increase their chances of continuing to approach Bayern Munich's points, because I see Leverkusen's current players look mediocre, especially in defense, so far Xabi has not been able to strengthen that sector. Only a few players can be relied on on the field.
If, for example, the new players who will be brought in in the second half of the season are able to adapt quickly, then of course they will be able to have a good impact in a short time too. But yes, because so far most new players are expected to make a good change, but in reality new players always need time to get their best performance in their new team. But regarding whether or not Bayer Leverkusen is able to defend the title, I don't think so.
But, when it comes to whether or not Bayer Leverkusen still have a chance to compete for the trophy this season, I think yes, Bayer Leverkusen still have a chance to compete. Because honestly, to defend the title is a very difficult task, moreover Bayern Munich also always managed to return to dominate the Bundesliga even though the road was not entirely smooth and not entirely easy either.