He didnt go after him last time so not sure what you mean here

He was an in his prime elite defender at that time. Grigson never went after those. He chased bargains and character concerns.

Here is one of my biggest problems with Grigson:

"So I grabbed him. I told a couple of guys not to let him leave the building. I called his agent back and we closed the deal. It's not time to play hardball when you have a pass rusher walking out your door -- let alone when it's 'The Hunter.' I just wasn't letting him leave, no matter what. And we go from one minute of despair and potential loss to closing the deal, and everyone's hugging, including you and the player."

Who's he talking about? A washed up Trent Cole. No doubt in my mind that Grigson didn't listen to his pro scouts on this one and totally made his decision on emotion and past familiarity.

He is over 30 now and past his prime, so perfect for Grigson's vision of Free agency

Jeff Darlington
The plan is for Ndamukong Suh to be released as early as today as the Dolphins continue their attempt at a culture change – a plan that has purged arguably Miami’s three most talented players within last year. A lot riding on 2018.