Marvin Harrison Jr. is the NFL's most difficult player to project

Arizona's last-second loss to Seattle in Week 4 was an almost uncanny distillation of receiver Marvin Harrison Jr.'s promise and frustrating play.

Seattle’s last-second win Thursday in Arizona will be remembered as a game that had a bit of everything: a blowout-in-the-making that came down to a final kick; a hold that negated a Seahawks touchdown; a late offensive revival by a Cardinals offense that was booed by the hometown crowd for much of the first half; and the points that were traded, back and forth, during a flurry of fourth-quarter drives.

And by showcasing a bit of everything from Cardinals receiver Marvin Harrison Jr., it was also an almost uncanny distillation of the promise and puzzling plays that have defined the first 21 games of his career.

In his second season, the can’t-miss former prospect still can’t quite be figured out.

Official statistics recorded a team-high 66 yards, on six catches, including a touchdown, for Harrison in Week 4 of the young season. Yet in the eye of the beholder, the game provided compelling and competing evidence for both sides of the argument over whether Harrison will ever reach the potential that his college offensive coordinator predicted, before Harrison had even declared for the 2024 NFL draft — that he would eventually be in the Pro Football Hall of Fame alongside his namesake father, one of the most productive receivers of all time.

Teams apparently agreed that the assessment wasn't too sky-high. Arizona selected Harrison fourth overall in 2024, the highest a receiver had been taken in nine years.