Dortmund victory against Frankfurt was very impressive with massive numbers of goals, if Dortmund can continue with a great performance like this winning Bundesliga won't be hard for them , with addition of Bayern Munich poor performance, Dortmund will grab this opportunity.
Dortmund were able to secure a remarkable victory with Frankfurt. Dortmund managed to top the points table as Bayern Munich lost a match. But I think Dortmund won't stay at the top for long, as Bayern Munich will hope to win the next matches to take themselves more points to the top of the table.
Dortmund took advantage of the fact that Bayern Munich lost few hours before. They had strong nerves. The remaining schedule is a bit easier for Dortmund than for Bayern Munich. Bayern has still to play aganinst Hertha Berlin and Schalke. Both teams have their backs to the wall and must win. They have nothing to lose. These will not be easy opponents for Bayern Munich. Dortmund really could manage to become the German champions this year.