All those teams that were willing to dropped a 2nd for Cooper have to be contenders with legit QBs and will be picking at the bottom of the 1st round. Doubt they were going to meet the Raiders asking price of a 1st because they still will have to pay the guy $14M and you lose him after next season if he doesn't perform. The cowboys front office overpaid for a position of need, a 2nd + 3 or 4 should have gotten the deal done. They could have had Gordon for a 5th with a higher ROI and lesser risk.
For some reason I'm having a hard time believing the Eagles were going to overpay for Cooper. They are masters of finding value in trading picks, remember they turned Sam Bradford into a 1st from the Vikings and traded a 4th to the Dolphins for Ajayi.