https://www.miamiherald.com/sports/spt-columns-blogs/barry-jackson/article232106497.html One of the intriguing subplots of Dolphins training camp will be sorting out a defensive backfield where at least one starting job is open and roles have changed for at least two key players. Here’s what we’ve learned in the weeks since the offseason program ended: ▪ The Dolphins were pleased with how Bobby McCain fared in his move from cornerback to free safety and are now comfortable leaving him there, barring a sudden need for him at cornerback, according to multiple sources. The new role will allow McCain to play in dime packages and give Reshad Jones and T.J. McDonald a breather when needed, with Jones and McDonald both equipped to play strong safety in a two-man pairing with McCain. Expect the three of them will play together some. ▪ The Dolphins would love for Eric Rowe to win the boundary cornerback job opposite Xavien Howard; he was given every opportunity to do that in the offseason program with consistent first-team work, according to a source. The results have been mixed so far, with Rowe beaten several times in the five practices open to the media. The Dolphins like what they’ve seen from former Patriots 5-10 practice squad cornerback Jomal Wiltz and he could assume a role in certain packages if he impresses in training camp and preseason games. Wiltz played alongside starters in some formations in the offseason program, according to a source So how will the Dolphins find enough snaps for six defensive backs — Xavien Howard, Fitzpatrick, Jones, McDonald, McCain and potentially Rowe — if there aren’t injuries? That shouldn’t be a problem. Keep in mind that the Patriots, with Flores as de facto defensive coordinator, used six natural defensive backs on 27 percent of their defensive snaps last season — among the highest totals in the league. What’s more, the Patriots last year used a formation with three defensive linemen, two linebackers and six defensive backs on 20 percent of their defensive snaps, per Pro Football Focus. For perspective, the league — on average — used that alignment just three percent of the time. But that 3-2-6 lineup appears to make sense for Miami in a pass-happy league for a couple of reasons: Miami has more established quality NFL players in the defensive backfield than on the defensive line. Playing a lot of three-man line (with some combination of Christian Wilkins, Davon Godchaux, Akeem Spence, Vincent Taylor, Tank Carradine, plus ends/linebackers Charles Harris and Nate Orchard) will mask the modest talent at defensive end. Also in that lineup, the Dolphins can get by with Jerome Baker and Kiko Alonso as their two linebackers on the field, with Raekwon McMillan going to the bench in clear passing situations. Last year, the Patriots used four defensive linemen, one linebacker and six defensive backs on seven percent of their plays, which is another option for Flores here. They used two lineman, three linebackers and six defensive backs only one play all season.