Bill, most of this is simply false.
Cooper is 6'1", 211 lbs
http://www.nfl.com/combine/profiles/amari-cooper?id=2552487
Sammy is 6'1", 211 lbs.
http://www.nfl.com/combine/profiles/sammy-watkins?id=2543457
Cooper's drop rate was 7.1% as a rookie and 2.3% last year.
Sammy's drop rate was 3.1% as a rookie, 3.1% in year 2, and 3.9% last year
On a per-target basis, Sammy smokes Cooper despite playing with a QB that is clearly not the passer that Carr is at the current time.
And that brings me back to my point: Cooper is probably a top-10 WR in the NFL by most accounts.
Sammy has 2 seasons of performing like a No. 1 WR despite a staggering lack of opportunity in comparison to his peers.
The only issue with him is availability. Now, if someone places a higher level of emphasis on that than someone else, sure, that's an argument worth having.
Whether or not he's as productive as other guys when given the targets is not up for debate.