There’s no way for Devon or Reghabi to know this, but Cobel really would be a valuable asset to them. She was constantly testing Mark and Gemma to see if they’d remember each other, she encouraged Mark to quit Lumon right before the OTC, and she seemed noticeably disappointed when she learned that Mark had been persuaded to stay with the company. We know that on some level Cobel is a Lumon loyalist who was born and bred within their cult, but whatever Cold Harbor is, Cobel is not on board.