The tag will be over 19 million. Edmunds could simply sign it and we are screwed cap wise, since we can't pro rate the cap hit over a longer period of time.
I think he makes the team but is a healthy scratch most games. He likely starts next year but shares snaps with Cook. He then moves on after his contract expires. He's a good player who played hurt last year. He will play well this year and next.
If was going to get a big money deal you think he would have gotten it by now. Maybe teams want to see if he has recovered from his injuries or if he is still a top CB.