Taking the other side of the field on this.... There is always the philosophy of: Always sign the guy who has something to prove.
Sam was defensive player of the year last year. He did great in preseason with 3 sacks (no pun). He had a bad practice with the Rams but on the field he is fast and good.
The Cowboys' defense, however, sucks. They need speed. They need sacks.
Let's see how he does.
I don't believe in dismissing anyone simply because of XX label any more than I believe in promoting someone based on XX label. Let his individual achievement judge him.