Question of the Week: How are power and playoff rankings different?
Answer: If you have a league with at least two divisions, the playoff rankings will utilize best division record as a tiebreaker, just like the NFL. The power ranking does not include this tiebreaker.
The other thing leagues with divisions should keep in mind is that the top two divisional winners will get the top two seeds. More on that from the Owner’s Manual: http://www.fleaflicker.com/help/how-are-playoff-seeds-determined