What I do know is not to trust Jerry's judgement in these situations, especially when he goes around the process. What I do know is in both the Lance and Mingo situations their former teams gave up a lot to get these 2 players and in less then 2 years they wanted to be done with them. Trading them for a fraction of what they paid for them (and now to your point neither have show anything on game day or apparently to their former teams in camp or practice.
On top of that the Cowboys are looking to draft a WR #2 early in the draft, so it seems they have already determined that is not Mingo.
"At the time of trade, Lance had just been demoted to third-string backup, two years after being the third overall pick that the 49ers had traded three first-round picks"
"Mingo was an early second-round pick of the Panthers in 2023 that the Cowboys had high on their draft board. In roughly a season and a half, he played in 24 games with 19 starts. Out of 111 targets, he caught 55 passes for 539 yards and failed to score a touchdown. Only 19 of his catches resulted in a first down. In eight games with the Cowboys last year, he started once and finished with five receptions for 46 yards, no touchdowns, and two first downs on 16 targets."