Granted I am a Bills fan, but can someone tell me what was the difference in the Brandon Cooks play that was deemed an interception and the Davante Adams one tonight that was called a catch and down by contact?
Sure. First we must review the rule for a legal catch - get two feet down, and make a "football move" (or some such terminology). If you are immediately tackled or go out of bounds, obviously you cannot make a football move. In that case, you are deemed to have completed the catch if you "survive the ground" - the ball does not come loose when you hit the ground.
Cooks was immediately brought to the ground without making a football move. Therefore, the catch had to survive the ground. Refs ruled it didn't.
Adams caught the ball AND made a football move. Therefore, it's a catch and down by contact. It did not have to survive the ground.