The Rams are definitely loading up for a run. I think Cooks and Sammy Watkins are about a wash. Defensively they are going to be tough. Goff does not scare me though. He could be the weak link.
Watkins has had about 50% of the production Cooks has had the last two seasons.
The Rams made this move because they clearly think Cooks is going to give them a lot more. I wouldn't bet against it. Call him whatever you like, but the guy produces yards and that's ultimately the point.