Even though they were feuding last season, you think Goodell and Booger didn't have some discussion about the last game of the season? PHL was throwing the last game away, which was bad enough for the ticket buyers, if the Cowboys had run the backups out there and turned that into another pretend game, there would have been a lot of negative discussions in then media.
I don't think tanking is possible because there are too many that would have to know what's going on and someone would blow the whistle. Can't hide something like that.