"Very important. We've built a good relationship so far," Cooper said. "From the time I got here, we were able to hit the ground running, and just from my experience in being in the NFL I wouldn't say that's a common thing. Sometimes you can line up with a quarterback after getting traded or going to a new team, whether it's the draft or whatever, and it not go smooth. And so, I wouldn't try to trade that for anything because I know what can be on the other side of that. I would say it's very important."