Because keeping him as the primary backup is a horrible idea, and if he performs at all he could net you a comp pick. I'm a fan of what Lance could be, but having him backup Dak would be a terrible idea. You really need a backup who can step right into the offense your starter is running. Lance needs a team that runs a lot of RPOs, read options, etc. which is all stuff that the Cowboys dont have Dak run at this point in his career. Unless the Cowboys have plans to radically change the QB position for 2025 Trey Lance needs to move on and try to catch a backup role for a team like Baltimore, Washington, Philly, etc.