The Cowboys have traded a 2015 7th round pick to Tenn for DE Lavar Edwards, so they appear to be out of the running for Sam.
Looks like he was outplayed by his fellow rookie, but played very well and probably was not the ninth or tenth best at his position on the team--his play was strong in the preseason as a rookie (3 sacks) and surely is more than good enough to take a roster spot elsewhere.