They are not totally different, it is just that what they have achieved last season was literally impossible to repeat. This reminds me of Lionel Messi when he scored 50 goals in La Liga in one season and the next season people said he is not living up to expectations because he only scored 40 goals. I think that is ridiculous. A more realistic view on things is required here as everyone with an idea about football knows that going unbeaten for two consecutive seasons is twice as impossible as it is to go one season unbeaten.
There is no difference Leverkusen is still the same as last season, for the current performance may be said to be a little down because of many disappointing results including a draw in two matches.
Especially now dealing with Liverpool, of course it is a difficult opponent so it is also difficult to beat.
Whatever the result can happen or surprises will come at any time, in terms of seeing which opportunity wins I determine Liverpool.