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Actually it's 3 goals. Because if Frankfurt loses by 1 goal but in a VERY high scoring game like 6:7 they would still be ahead of Dortmund. I know a result like this is unlikely but mathematically a 2 goal difference win can be not enough. So saying 3 goal difference and nothing else matters is the right wording. But yeah, I am also scared BVB will fumble it yet again on the 34th day, just like 2 years ago at home against Mainz.
The chances of Frankfurt losing by 5-4 or 6-5 not a bigger difference but enough goals, are the same chances of Dortmund losing with Kiel, let's be real about it, would you take a bet on that even happening? You have team that only once last year lost by 5 goals against Bayern and one that only once scored 5 goals. Common!
Freiburg has a negative goal difference, they have an average of 1.3 goals per match, and now they are going to score 6?
If we're there, let's talk about Dortmund losing with Kiel and Maizn beating Bayer by five goals so Dortmund will lose even the 5th place.