PFF is aptly named because it's the sound I make with my mouth whenever they're brought up.
Justin Jefferson is an awesome rookie, maybe even OROTY, but his impact has largely been in 2 huge games. In 5 out of 8 games he has 3 receptions or fewer. Diggs' impact is twice as big at least.
Also, some people talk as if we traded away Jefferson for Diggs. Unless you can see into the parallel universe where we specifically take Jefferson with that pick, we traded the pick.