If you are referring to an 8 team playoff bracket, it was by draw therefore a division winner would play a #2 seed from another division. These were done randomly. Sometimes divisions are not equal. One may have 9 teams and another may have 8. So you can't use points to seed all the #1s and all the #2s.
If you are referring to the post season tournament then it was ranked by the placement points the team had. That was basically the best way to seed the tournament.