I do think this line certainly has the potential to be better.
Losing Leary stinks but it's easy to mask a weakness between two all pro players if Collins can excel at RT.
I really believe Green if healthy could be better than Leary. I know that health is a big if with him, but he showed last year the power and movement skills to play tackle. If he can adjust to playing inside, his upside is higher.
The same might could be said of Cooper, but I'm not sure he was ever the player Arizona was hoping he would be when it took him in the first round, and the devastating injury seems to have taken away some of his greatest asset, his quickness. Maybe because of the injury he hasn't been able to show much of that player, but what I see when I watch footage of him is a guy whose power is inconsistent, which is what I saw of him in college, frankly.