You should try Google sometime and look up some quick stats before posting next time. You wouldn't sound so foolish.
Cowboys used a 2nd round pick (Kelvin Joseph) and 3rd round pick (Nayshon Wright) on CBs only 3 years ago during the 2021 draft.
That's besides using a 2nd round pick (Trevon Diggs) in 2020. Plus, a 2nd round pick (Chidobe Awuzie) and a 3rd round pick (Jourdan Lewis) in 2017.
https://www.pro-football-reference.com/teams/dal/draft.htm
All high Day 2 2nd & 3rd round picks.
You were saying???