For Eagles to win the division:
We go 3-3 in the last 6 they still have to go 7-0 just to tie us then it would still come down to tiebreakers I'm not sure who would get the tiebreaker. To win the division outright they have to go 7-0 and we go 2-4 or worse.
For Seattle to catch us for #1 seed:
We have to lose at least 2 games and they win out the best they can do is 13-2-1 if we lose once we'd still be 14-2. A loss here we'd have to lose at least 3 games for them to catch us. Then only the Giants can catch us with 2 additional losses nobody can catch us with one additional loss.