Milan's overall condition seems weaker than last season. On the other hand, the Liverpool team is in a very good position. Liverpool's players are now very confident after winning three matches in the Premier League. Therefore, the probability of Liverpool winning against Milan is the highest. I would say Liverpool will make no mistake in this match.
I agree with this. Liverpool is in a superior form than Milan and they will be the undisputed favourite to win that match. The only advantage Milan has is that they're at home but even that won't matter much against Liverpool in their current form.
I understand that the Champions League is different and maybe a different atmosphere for Liverpool but I don't think that would be the case based on the level of confidence Liverpool show currently.
I believe we should not underestimate Leverkusen's ability against any team this season, probable they don't want any of their main players to be injured before the Champions League games, which is why they don't want to put a lot of pressure on the Bundesliga title this season after losing to Leipzig in their last game, but I'm looking forward to seeing how Leverkusen competes with another great team in the Champions League this season.
The Champions League is not a reason they lost their match against Leipzig, they lost because Leipzig was better. Leverkusen didn't play badly, but Leipzig was just better.
For the Champions League, the tough fixtures they'll have are against Liverpool, Inter, and Milan. They might get some points from those matches and also get a lot of points from the other matches so there's no need for them to panic. I don't think anybody is underrating them, I wouldn't.