Honestly , Leverkusen is playing so smooth that I wouldn't be surprise to see them in the finals or even winning it because right now they seem to be one of the first candidates alongside Liverpool to win the trophy this year.
Out of all the teams in the Europa League, I am thinking Liverpool and maybe Bayern Leverkusen to be either in the finals or one of them will reach final because both these teams are very good and well organized and they are both doing well in their respective leagues.