What makes Justin Jefferson just so good?

With a veteran's eye, Justin Jefferson immediately spots the mistake in a rare lowlight from his first two NFL seasons.

Sitting in the equipment room at TCO Performance Center last month, the Vikings' 23-year-old superstar receiver watches on a smartphone as a third-down pass falls to the turf with All-Pro cornerback Jalen Ramsey defending in a loss to the Rams last season.

Jefferson points at the screen when his knees briefly stutter and his head ducks in front of Ramsey about 5 yards downfield.

"This is really my fault," Jefferson says. "I'm knee stuttering too early, allows him to not bite on it as much. You see how he bit on it? But he had time to really recover because I did it so early.…