I don't know what happened to Leipzig in that game for their defense to be so bad that they conceded 6 goals in the very first league game. This could be a bad sign for Leipzig, who weren't doing well last season, and I see that they'll continue to be good this season. On the other hand, we have Bayern, who were good last season, and it seems that they'll be much better this season. I see them being champions again.
RB Leipzig is a strong team, they were just unlucky to play away in their opening match & have to face Bayern Munich. Bayern Munich, playing in front of their own supporters, certainly wanted to give the best they could & they made it. As for the league title, there's no need to over-debate it. I've often said that Ligue 1 (France) and the Bundesliga (Germany) are farmer's leagues, and they will only belong to PSG and Bayern Munich. If they don't, their season's performance will be poor.