Impressive company. I was looking at Michael Thomas' stats the other day. Amazing beginning of his career (5512 yards in 4 years, improved every year). Then he fell off a cliff. He's played 20 games in the past 4 years, for a combined 1057 yards.
Jefferson has had 5900 yards in 4 years, while missing half this season. He's truly been on another level. Let's see what happens. Thomas got the injury bug after 4 years, and Jefferson got injured in year 4.
Ceedee has been impressive considering he's only been the #1 receiving option for 2 of his first 4 years.
Randy Moss is in another world. He had 6 more 1K yard seasons after his first 4 years. And you could argue that he really underachieved during his career.