I'd sign Lawrence first and foremost. Then, I'd lean toward Cooper. And finally I'd probably sign Prescott. Not just because RBs are easier to find, which they are, but because QBs are MUCH harder to find. I don't want to go through another search and rescue like we did after Aikman retired.
I love Elliott and it's great he led in yards, but he needs to nail home more than 6 TDs for me to call him irreplaceable.
I'm not really sure why this topic go piggy-backed off of the Cowboys forum, but I have a feeling all 4 get signed and everyone is arguing for noting.