I think you meant to say that JoeJuan Williams only STARTED 1 game in 3 seasons. He played in 36 of 49 games in 3 season.
I'm NOT saying Williams is "all-world" or anything., Just that you're misrepresenting him.
Williams is a reserve corner on the outside. He does a decent job. Opposing QBs were 10 of 18 when targetting him last year. That's just 55%. Over 3 seasons, he's given up 2 TDs on 19 completions. He'll be fighting Butler, Hafford, Jack Jones, Wade, and Mitchell for an Outside Corner spot.
Wade offers value in that, as others mentioned, he played both the slot and outside in College. He was a significantly better slot corner. However he did line-up outside 9 times for the Parts. No, it's not a big sample size at all.
The 3 players "guaranteed" spots out of the 9 CBs, are Mills, Marcus Jones, and Jack Jones, Everything else is up for grabs, imho. And that includes whether the Pats carry 5 or 6 corners. Not including Justin Bethel.