Correct me if I'm wrong but, 3 plays 6 seed-winner plays 1 seed no matter who wins. 4 plays 5 seed winner plays 2 seed. NFL does not re-seed after first round. Thats why we played AZ last year in 2nd round.
And as things stand now#2 and #3 will come from a pool of Chicago, Green Bay, Philly, and NY and #6 will come from that same pool plus the Bucs. So #6 beating #3 is quite conceivable. As a #5, we would face the winner of the west (#4) but then have to play outside in a very cold place regardless of who is #2.