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.
The conditions become difficult when in the end Bayern's financial condition which seems to be still difficult when compared to several other clubs makes them look for players will not be easy because they have to adjust to the budget they have.
Although last season their performance was outstanding and managed to benefit from winning trophies while boosting their popularity but in the end their finances were a little disturbed, of course this will make Xabi's condition difficult if the option he does is to look for alternative new players by overhauling the current squad.
Unless they try to offload some of the star players and replace them with new ones maybe this could still be possible because it could balance their coffers but on the other hand it could be a serious gamble in the end so I think Xabi will also think further in signing new players. Although it can still be done, in the end, some things will have to be sacrificed in order to make them balanced in terms of performance and finances.