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I only believe in Bayern Munich, for Bayer Leverkusen, even though the bookies favor them, there's a tendency that they will also get a draw in this match. Bayer Leverkusen's winning streak isn't an ordinary thing, it is not natural that they will get positive results continuously, that's the reason I'm not sure that Bayer Leverkusen can win easily against Werder Bremen.
Regarding Koln, they're currently in the relegation zone with Union Berlin, it's not impossible that they will be relegated at the end of the season considering their current performance.
You are surely right, betting on Bayern Munich is definitely a safe bet because Bayern Munich is a team with much more potential and they can have a much higher chance of winning the Bundesliga title than the other teams even against Dortmund and Leverkusen, they can definitely have a good chance.
But the fact about Leverkusen in this season is about their coach Xabi Alonso, his performance was definitely awesome and he is the only reason for some people to bet on Leverkusen for the end of this season.
Koln against Bayern Munich and Werder against Leverkusen are both profitable for the visitors. So it's no surprise that Bayern Munich and Leverkusen can score full points in this match without having to worry at all. So Bayern Munich needs to be a little patient, the difference is 2 points. I don't see this match being a big problem for both of them, Werder performance during this season has been very chaotic from the last 5 matches with only one win, 2 losses and 2 draws, the same as Koln last 5 matches in the Bundesliga, one win, 2 draws and 2 losses. In other words, Bayern Munich and Leverkusen both benefit.