I dont know why but i can feel a final between Liverpool and Rome, if Rome has the enoguht luck in his side they can be in the final and De Rossi seems like he have that and plus the players are with him 100%.
For me Leverkusen is not gonna reach the final. They are gonna be very bussy with Bundesliga and they are not so good on head to head.
Leverkusen is quite comfortable at the top of the Bundesliga standings with a 10 point lead so I think that way they don't have any pressure in the Bundesliga so they can focus on their Europa League matches.
I don't think what you say has a strong reason, it's impossible for Leverkusen to put aside the Europa League for the sake of the Bundesliga which they are almost certain to get.
Seriously, I don't think there will be a team in the Bundesliga that will be a challenge for Bayern Leverkusen. They are topping the table there, and I believe they are the favorites there. For now, Bayern Leverkusen have a high chance of winning the Bundesliga title. They don't have many obstacles there again, so even if they decide to focus on the Europa League, they can still make it in the Bundesliga. They are 10 points ahead of many teams, which is not a small interval, so you are right by saying they can do something here and make the Bundesliga title this season, and the fact that the Bundesliga title is already for them because I think there will be a team in the Bundesliga.
but once they see any changes from their play, they should go back and put in more effort in the Bundesliga because too much concentration in the Europa may weak some players, so I think they should know what to do at the exact time.