Just because it will be a "big slap" in Bayern's face, that doesn't mean it cannot happen. Also, that Bayern's home loss to Leverkusen was a DFB Pokal game, not the league game, so it's possible that Kompany did not prioritise it the same as league games or the Champions League. Their last league clash was a 1-1 draw (in Munich).
So considering their head-to-head results, Leverkusen should be the favourite to win. But of course, current form is much more important than past stats, and there will be quite a few games to go before those two meet on 15th Feb, so we'll have a better picture closer to that date.
ps. it's "Bayer" Leverkusen, not "Bayern".
@pawel777 I don't think it is worth the time to respond to guys like Moreno233. He is strange to say the last. His reasoning is a 0/10. The information he is spreading is 0/10. Saying that Alonso should aim for a draw against Bayern is a 10/10 on the stupidity scale considering that Leverkusen beat them in one of the most important games this season already. It's tough to read that crap.
But please do me a favor and don't talk the same way when you use words like prioritization. The games against Leverkusen are the most important ones for Bayern on the national level as they are the only ones who have a reasonable chance to take titles away from Bayern. Hence there is no prioritization. I agree that Leverkusen is the favorite to win the game in the second half of the season.
I read this "Bayern Leverkusen" a couple of times before, but can't remember whether it's always Moreno233. But you can see that they have no clue what's going on.