There is no question Trevon Diggs is irreplaceable. He is an all-pro cornerback with the most interceptions in the NFL in the last two seasons. With Diggs out for the rest of the year due to a torn ACL he suffered in practice a few weeks ago, DaRon Bland has now had to play in his place.
Bland burst onto the scene last season and has shown progress this year with two interceptions returned for touchdowns. He also had key deflections in the Cowboys' last game against the Chargers including one on a 4th and one in the redzone that gave the ball back to the offense. However, he was still a fifth round pick and with 11 games left, having Stephon Gilmore as your best corner should not sit well.
Jourdan Lewis had a fumble recovery against the 49ers but other than that he seems to be a step behind on most plays. Other than Lewis, the only other corner with experience on the roster is Noah Igbinoghene. He scored the team's first touchdown of the season on a blocked field goal return against the Giants, but has yet to contribute in the secondary. C.J. Goodwin is also unavailable due to a potential season-ending pectoral injury. The team also has Eric Scott Jr., a rookie who was a fourth round pick, but he has yet to see much of the field.
The bottom line is, with only one former all-pro corner and two starters with question marks, the Cowboys need to consider making a move at the deadline to bring in more help. Dallas is facing at least three teams the rest of this season with good receiving groups. The Eagles have two great ones in A.J. Brown and DeVonta Smith, the Dolphins have Tyreek Hill and Jayden Waddle, and the Bills have Stefon Diggs and Gabe Davis. Those are games the Cowboys will have to win towards to end of the season if they want to challenge for the division title and make a playoff push. Brining in help for the secondary should be on Jerry's mind.