OP has no clue what he's talking about.
Yes he does.
Let's lay this out.
For the Cowboys to get the #1 seed they have three basic scenarios:
1 - Win out and then total chaos where the Packers and Bucs lose two and have 5 losses (very unlikely)
2 - Win out, have the Packers lose once and the Bucs lost twice. We win head to head with GB. (unlikely)
3 - Win out, finish in at least a 3 way tie with any combo of the Bucs, Packers and Cards (most likely)
With the Cards losing today, if we beat them in two weeks, they would have 5 losses. So they are out as a potential team that could end up in a three way tie with us. That leaves only one possibility for a three way tie - the Bucs and Packers have to finish with 4 losses. So the OP is right, with the Cards losing we can only really have the Packers lose once more because it's UNLIKELY the Bucs will lose more than once. If the Pack lose two, the Bucs lose one and we win out............ we are the 2 seed via head to head with the Bucs.
So when the OP says the AZ loss hurts us, he's technically right. By them losing, the Cards are now no longer a team that could help us get a three way tie with the Bucs. We are now left with just the Packers as that team and that means they can't lose more than one game.