It was an amazing performance by Bayern Munich when facing a strong club. I didn't expect Bayern Munich to score many goals because usually strong clubs have a solid defense but not this time because Frankfurt couldn't withstand many attacks from Bayern Munich especially when the second half started. Bayern Munich seemed to start putting pressure on the away team so that the away team couldn't do much and finally had to swallow a bitter defeat. With Bayern Munich's performance this season I don't think Leverkusen can defend their trophy because Bayern Munich doesn't want to lose many trophies in several seasons so Bayern Munich is still a strong competitor in the Bundesliga in the hunt for trophies.
A big win at home is always extraordinary for any team including Bayern Munich who have given their best performance when hosting Frankfurt. So it is also true what you said that Bayern Munich is worthy of being called a title contender for this season because with such a performance in the Bundesliga it must be considered very good especially being able to make a team that has strength like Frankfurt unable to do anything in the match except surrender to the attacks made by the home team itself.