I have a feeling his isn't going to be activated of NFI this year. We've got him signed for next though
Last year Dline was a major problem, especially at the DT/NT spot(s). Dallas was pulling guys off the street. The potential for the quality of the depth of that Dline rotation is very impressive. I don't think it matters who starts, as much as can the those that don't start make a significant contribution when they're in the game.
If he is activated, I wouldn't expect Okoye (or Brent) to be a starter, but if the guy that go in for Melton or Crawford or Hayden or McClain, the quality of that rotation is impressive. It can mean starters can take more plays off and hopefully stay fresher/healthier as the season goes on.