If you want to dismiss one game probabilities, your original statement
is still not something that teams do. NO ONE judges a baseball team on a single game. Anything can happen in the game of baseball on a single day; you judge a team based on a much larger sample than that.
My point about the probability is that winning ALL your games against one opponent, no matter how bad, is hard. Even if you want to say the Cubs should win 80% of their games against the Braves, they'd still only win three in a row 51% of the time.
This isn't basketball.