"In my opinion, I thought he was the best in the draft," Kelly said, via Jordan Raanan of NJ.com. "I think he's showing people that."
Although Watkins and Evans were the consensus top receivers available, Beckham was viewed as a world-class athlete as well as the lone NFL-ready route runner.
Those skills have translated to the most impressive rookie season by a rookie wide receiver since Randy Moss exploded on the scene in 1998.
Beckham has joined Hall of Famer Don Hutson as the only receivers in NFL history to register at least 1,100 yards in 11 or fewer games. In the first eight starts of his career, Beckham has averaged 8.6 receptions, 126.8 yards and a touchdown per game -- numbers no wide receiver has ever matched over a full season.
"I haven't seen a young receiver like this explode this way without much practice time in my entire life," NFL Media analyst Mike Mayock raved last week.
If the 2014 NFL Draft was conducted again, there's a strong chance Beckham would go off the board with the No. 1 pick.
As a result, offensive coordinator Ben McAdoo is getting more creative with his high-octane weapon of defensive back destruction.
"They're obviously moving him around more," Kelly explained. "You have to know where he is at all times. They're obviously putting him in more positions."
Beckham is set up to serve Kelly one final rookie-year reminder of the coach's prescience.