The only think you're right about is Dallas matches up the best (at least on the offensive side) but you are totally off base on the details.
1. Mebane is not an all pro stop with trying to give praise in order to damn. Kevin Williams has played insanely well stepping in for him.
2. You acting like two second team all pros who play in the box will not affect the ability of the defense to stop Murray is beyond laughable.
3. Murray is not running any where near as effectively as he was when they played Seattle the first time. 400 carries tends to wear people down.
4. They just lost Henry Melton and another linebacker. Good luck stopping Lynch.
This game would be under much different circumstances than the first game. You're also wrong about how they matchup with the Packers. They don't match up well at all defense to offense. Rodgers should shred them.