Greg Ellis has been released by Oakland, and his agent said the outside linebacker/defensive end would be open to a return to the Cowboys. The Cowboys rarely rule anything out, including Ellis' return. But he didn't leave on the best of terms, he's 35 years old and there are reports out of the Raiders that he has an arthritic condition in his knee. Ellis had seven sacks and forced two fumbles in 14 games for the Raiders last season.