Acct#1 = 2nd place = 4th best GD
Acct#2 = 2nd place = best GD
Acct#3 = 1st place = best GD
Acct#4 = 3rd place = 2nd best GD
Acct#5 = 1st place = best GD

Its possible to be 1st place and have a low GD if you are a low scoring team and dont let in many goals.

Otherwise it makes sense for the team with the best GD to be 1st place since they usually either score the most goals or keep the most clean sheets....sometimes both.