I don't have statistics on this, but it seems like many if not most of the really good ones are great for a year or two then fall back to the pack. Revis comes to mind. He was amazing, then after getting a huge contract he fell off quite a bit. Patrick Peterson is an example of the opposite - he has been quite good for years.

My concern is that we pay Jalen Ramsey for the JR that he was and that we end up getting quite a bit less.