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.
It is also possible to recommend that Leverkusen should carry on systemic integration with actions that infuse new energy into a team. It may take in players with special ability, especially in defensive side can be one of the ways to balance the field. However adding your own and helping the existing players grow through accurate training techniques and concrete tactical back up you can enhance the creation. And with the cooperation of both, Leverkusen can go higher and stronger more consistently in the league.