Don't sell the Cowboys short. Their defense is half way decent. They can have shut down games if they get their game plan right. They've done it often enough that you have to bring your best to the table, to beat them.
Are they better than the Packers? They might be, but Prescott and Elliott do not match up to Rodgers and our pair of RBs. That will be the difference makers. Which offense springs their guys for the best game will win. Right now, in GB, I give the Packers a 4 to 5 point edge. In Dallas, a toss-up.
As for Dallas and the Cardinals? Dallas should blow them out when this coming week. The Cowboys are confident, and the Cards are on the ropes, and on the edge of free-fall. I think they play themselves right out of contention. But, it is the NFL, and any given day, anything can happen.