In the pair Frankfurt - Bavaria, in my opinion, Frankfurt is in great danger 
as Bayern will try to prove that this pair does not play the winner of the Euro Cup with the loser of the Euro Cup, but the current champion with an ordinary club.
Bayern first games generally end by a big victory but that doesn't mean that they sometimes miss it up. They will have Mane in the attack line, probably replacing Lewandowski. For Frankfurt, they will try to grab Mario Gotze among the other transfers. This game particularly might be challenging so let's wait until we get a better view on both teams days before the match. as Bayern will try to prove that this pair does not play the winner of the Euro Cup with the loser of the Euro Cup, but the current champion with an ordinary club.Mane will already be in Bavaria, this is understandable. But these are all trifles, I think that whatever happens in the off-season, Bayern will be overvalued, which means that it will make sense to bet on Frankfurt. It seems to me that in the first 5-6 rounds bookmakers will give odds not in accordance with the real strength of the teams, but only in accordance with the "loudness" of their name.