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It's hard to really say much or little. At the beginning of the season everyone wrote Leverkusen off, but now they are four points behind Bayern. Only half of the season has passed and if Liverkusen remain stable, then we can start to think that it is dangerous for Bayern, but now I agree with you that they are very far from the first place, Bayer play a lot of draws.
The pressure from Leverkusen makes the competition more challenging, Xabi Alonso just needs to maintain his team's performance so as not to slip under any circumstances to keep the competition alive. Anything can happen in the second half of the season, including Bayern Munich dropping points like they did against Mainz. The four-point gap is not too far, there is still a possibility of a change in position if Bayern Munich is unable to maintain the consistency they have shown so far.
Dortmund are looking to get back into the top four, they could spring a surprise in the second half of the season having been a regular team to qualify for the Champions League. They are also a threat to other big teams because they always appear different when competing in Big Match games.
Bayern Munich full strength football team could not win the match against FSV Mainz 05 full strength football team because they did blunders in this match and match was ended with the result of 2-1 and Bayern Munich lost this the match but after this match that team did good come back against RB Leipzig full strength team and won the match one sided.Bayern Munich did 5 goals in this match which is Osum performance by the players of that team. Leverkusen full strength team will play next match against Borussia Dortmund full strength team and Borussia Dortmund is favorite for that match because head to head performance of Borussia Dortmund is Osum and that team won for more times and Leverkusen won for only one time but It doesn't mean Leverkusen could not win against Borussia Dortmund and match will be tough for both teams and any team could be winner of this match.