It was widely known at the time.
As I said I’m all for the signing at that price, that room is weak.
Just a snippet from a brief search:
According to multiple sources informed of the situation in New Orleans, Cooks was dealt because of a combination of his unhappiness with his role, his doubts that aging quarterback Drew Brees could get him the ball deep, the Saints' frustrations with Cooks focusing on his numbers and their disbelief he should be paid
And here’s latest with Dallas:
Brandin Cooks, a veteran wide receiver, has signed with the New Orleans Saints after expressing frustration with his limited role with the Dallas Cowboys, and he was a first-round pick of the Saints in 2014.
Better feed the man haha.