Nate Ebner has the most experience with 30 games under his belt. In that time he has accumulated 23 tackles and 2 fumble recoveries.
Tavon Wilson has started 4 of the 29 games he has appeared in and seems to get his hands on the ball quite often. In his brief career, he has had 5 interceptions and 2 fumble recoveries to go along with his 44 tackles.
Harmon and Davis were both rookies this past season and will look to have a greater impact next season. Harmon got a lot game experience this season as he suited up for 15 games and started 3. In his rookie season he had 2 interceptions and 31 tackles. Davis spent a majority of the season on the Patriots' practice squad but did get to play in 3 games.
Obviously, my failure to include Devin McCourty in this blog entry is because he already is a well-known starter on the Patriots' defense and his role will not be affected by Gregory's release.