I agree with you. Bayern Munich's elimination from the DFB Pokal is good for Bayern Munich. Now Bayern Munich will be able to focus more on the Champions League matches. If the schedule is too busy, it becomes very difficult to maintain a good performance. Bayern Munich's performance in the Champions League matches is very irregular. The team is in 13th position in the points table. Bayern Munich has lost two out of 5 matches. Winning the Bundesliga title will not be difficult for Munich. However, doing well in the Champions League is very difficult for Bayern Munich.
The elimination in DFB Pokal won't automatically increase the chance of Bayern Munich winning the matches in UCL. The level of these competitions is different, UCL is surely harder than DFB Pokal. If Bayern Munich still couldn't get optimum results in UCL, it wasn't because they have another focus on domestic matches. I think it is because Kompany has no much experience in UCL as a coach. However, it is not too bad that Bayern Munich is 13th place, they still have the chance to qualify for the next round. But they probably need to struggle at play-offs phase.
In Bundesliga, Bayern Munich is leading with quite convincing points. But I think it isn't a very safe point, there is still chance that other teams can overtake it. There are still many matches left, it won't be so easy to win the second half of the season. In many cases, the second half of the season will be more challenging than the first half of the season. So, Bayern Munich must be always very careful and don't miss any opportunity to get 3 points.
There is always something positive to take, even if defeat is still disappointing, but I think Bayern Munich defeat in the DFB Pokal does give them a bigger advantage going forward. Kompany can focus more on securing their chances of qualifying for the last 16 without having to go through the playoffs, although everyone knows that Kompany still has very little experience there. In the Bundesliga, their position is not completely secure, but with the declining performance of Leverkusen and Dortmund, I don't think they will be too worried.
It's not easy to win when you have to play with 10 men, while the opponent they face is Leverkusen. I think the defeat is very reasonable, and Leverkusen will likely use the DFB Pokal as their priority competition going forward. Looking at Bayern Munich's next three matches in the Champions League, Kompany will most likely be able to lead his team to full points and lead his team to the last 16.